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Home > Web Development > Microservices > Building Serverless Microservices in Python
Building Serverless Microservices in Python
Building Serverless Microservices in Python

Building Serverless Microservices in Python: A complete guide to building, testing, and deploying microservices using serverless computing on AWS

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Building Serverless Microservices in Python

Securing your serverless microservices

In this section, we will discuss security in detail.

Lambda security

As we discussed earlier, AWS Lambda is the central component in a serverless stack, or the integration connector with your custom code, triggered by events between AWS managed services. A Lambda function always has an execution IAM role associated with it, and using policies attached to that role is one of the best, and most secure, ways to deny or grant it access to other AWS resources. The beauty is that there is no need to manage or exchange any keys or passwords for a lot of the AWS managed services, such as S3, DynamoDB, and Kinesis Stream. There are some exceptions, such as some of the Amazon Relational Database Service...

Building a serverless microservice data API

In this section, we will look at the architecture and requirements of building a serverless microservice. The rest of the chapter is heavily hands-on in terms of configuration in the AWS Management Console, but also Python code. The Python code follows basic design patterns and is kept simple, so that you can understand and easily adapt it for your own use cases.

Serverless microservice data API requirements

We want to create a microservice that is able to serve a web visits count, for a specific event, of the total users browsing your website.

Setting up Lambda security in the AWS Management Console

We will be signing into the AWS Management Console. The reason we are using the Management Console first is to give you a better understanding of how Lambda functions work, and how they integrate with the other AWS services, such as API Gateway and DynamoDB. In later chapters, we will show you how to deploy Lambda functions using the AWS CLI. If you are a first-timer to Lambda, then I always find it useful to first create a full serverless stack manually in the Management Console to gain a better and deeper understanding than, say, have a magic command spin up the full AWS infrastructure!

We are going to first use the AWS Management Console to create the Lambda IAM role and policies, so that the Lambda function can access DynamoDB, and also write any logs or any statuses to CloudWatch. The Management Console, which we used...

Creating and writing to a NoSQL database called DynamoDB using AWS

We are going to look at creating a DynamoDB table, writing data to the table from hardcoded values, writing data records from a file, and then we are going to show two different ways to query a table:

Creating a DynamoDB in AWS

The following steps show how to create a DynamoDB:

  1. You need to sign in to the AWS Management Console first and then open the AWS DynamoDB console at https://console.aws.amazon.com/dynamodb/.
  2. Choose Create table or, in the DynamoDB navigation pane, choose Tables and choose Create table.
  3. In the Create DynamoDB Table window, perform the following steps:
    1. Under Table name, type user-visits
    2. In Primary key for Partition key, type EventId and...

Creating and writing to a NoSQL database called DynamoDB using Python

Now that we understand how to create a table, add data, and query DynamoDB using the AWS Console, we will look at how we can do this using only Python code.

We recommend you use a Python Integrated development environment (IDE) such as Eclipse PyDev (http://www.pydev.org/download.html) or PyCharm (https://www.jetbrains.com/pycharm/). You do not need to use an IDE, but I would recommend that you do. If you really want to, you can use VI, for example, on Linux to actually edit your code. But using an IDE allows you, for example, to run debugging or set up unit testing locally and step through it, which makes it easier and more productive for development.

First create the table using Boto3 https://boto3.readthedocs.io/ in Python. Run the code in the following section in PyCharm or your favorite text editor...

Creating a Lambda to query DynamoDB

Now that we have the security and user-visits table set up with some data, and know how to write code to query that DynamoDB table, we will write the Lambda Python code.

Creating the Lambda function

Now we have the IAM role with two IAM policies attached, create the Lambda function itself. Here, we are creating a function from scratch, as we want to walk through the full details to deepen your understanding of what is involved in creating a serverless stack. The following diagram shows data API architecture involving CloudWatch, DynamoDB, IAM, and Lambda:

Perform the following steps:

  1. Sign in to the AWS Management Console and open the AWS Lambda console at https://console.aws.amazon.com/lambda/...

Setting up the API Gateway and integrating it with a Lambda proxy

Now that we know the Lambda function works with some API Gateway test data, and returns a header and body with a statusCode of 200, we just need to add the API Gateway that will invoke the Lambda function, as shown in the following diagram:

Perform the following steps:

  1. Sign in to the AWS Management Console and open the API Gateway console at https://console.aws.amazon.com/apigateway/.
  2. Choose Get Started or, in the Amazon API Gateway navigation pane, choose APIs and choose Create API.
  3. On the Create page, perform the following steps:
    1. In Choose Protocol, select REST
    2. In Create new API, select New API
    3. Under Settings, type metrics for API name
    4. Choose Regional for Endpoint Type
    5. Choose Create API
  4. Choose Create Resource from the Actions drop-down menu.
  5. In the New Child Resource window, perform the following steps...

Connecting API Gateway, Lambda, and DynamoDB

Now that we know the API Gateway integration with the Lambda function works, we will deploy it and get the URL. The architecture is shown in the following diagram:

The workings of this architecture is as follows:

  1. Sign in to the AWS Management Console and open the API Gateway console at https://console.aws.amazon.com/apigateway/.
  2. In the Amazon API Gateway navigation pane, choose APIs and metrics.
  3. Select Resources under metrics and /Vists/{resourceId}, and choose Deploy API from the Actions drop-down menu.
  4. In the Deploy API pop-up window, perform the following steps:
    1. In Deployment stage, choose [New Stage]
    2. In Stage name, type prod
    3. In Stage description, type prod
    4. Select Deploy
  5. The Stages under metrics should be automatically selected on the left-hand menu.
  6. Select GET under prod/visits/{resourceId}/GET to get the invoke URL. The invoke...

Cleaning-up

You will need to delete the resources manually. I recommend you use the AWS Console to do so. Perform the following steps:

  1. Deleting API Gateway:
    1. Log on to the Console at https://console.aws.amazon.com/apigateway/
    2. Choose Resource under metrics on the left-hand APIs menu
    3. Choose Delete API from the Actions drop-down menu
    4. Type metrics in the Enter the name of the API before confirming this action textbox
    5. Choose Delete API
  2. Deleting the DynamoDB table:
    1. Log on to the Console at https://console.aws.amazon.com/dynamodb/
    2. Choose Tables on the left-hand DynamoDB menu
    3. Choose user-visits
    4. Choose Delete table
    5. Choose Delete
  1. Deleting the Lambda function:
    1. Log on to the Console at https://console.aws.amazon.com/lambda/
    2. Choose Functions on the left-hand AWS Lambda menu
    3. Choose lambda-dynamo-data-api
    4. Choose Delete function under the Actions menu
    5. Choose Delete
  2. Deleting...

Summary

In this chapter, we have discussed security and why it is important. Applying the OWASP security by design principles is a good first step to ensure that your serverless stack is secure. We then discussed IAM roles and gave an overview of policies, explaining how they are the key documents to ensure restricted access to AWS resources. We then looked at an overview of some of the security concepts and principles regarding securing your serverless microservices, specifically regarding Lambda, API Gateway, and DynamoDB.

We then built a scalable serverless microservice with a RESTful data API. We started by creating a DynamoDB table, then added data to it, and queried it, first using the AWS console manually, then using the Python Boto3 SDK. We then built a simple Lambda to parse the request URL parameters, query DynamoDB, and return the records as part of a response body....

Setting up Lambda security in the AWS Management Console

We will be signing into the AWS Management Console. The reason we are using the Management Console first is to give you a better understanding of how Lambda functions work, and how they integrate with the other AWS services, such as API Gateway and DynamoDB. In later chapters, we will show you how to deploy Lambda functions using the AWS CLI. If you are a first-timer to Lambda, then I always find it useful to first create a full serverless stack manually in the Management Console to gain a better and deeper understanding than, say, have a magic command spin up the full AWS infrastructure!

We are going to first use the AWS Management Console to create the Lambda IAM role and policies, so that the Lambda function can access DynamoDB, and also write any logs or any statuses to CloudWatch. The Management Console, which we used earlier, in Chapter 1, Serverless Microservices Architectures and Patterns, allows you to centrally control all...

Creating and writing to a NoSQL database called DynamoDB using AWS

We are going to look at creating a DynamoDB table, writing data to the table from hardcoded values, writing data records from a file, and then we are going to show two different ways to query a table:

Creating a DynamoDB in AWS

The following steps show how to create a DynamoDB:

  1. You need to sign in to the AWS Management Console first and then open the AWS DynamoDB console at https://console.aws.amazon.com/dynamodb/.
  2. Choose Create table or, in the DynamoDB navigation pane, choose Tables and choose Create table.
  3. In the Create DynamoDB Table window, perform the following steps:
    1. Under Table name, type user-visits
    2. In Primary key for Partition key, type EventId and choose String
    3. Check the Add sort key box
    4. In Sort Key, type EventDay and choose Number

The partition key and hash key can be used interchangeably, like sort key and range keys. A primary key can be the partition key alone, or a composite key with both a partition key and a sort...

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Key benefits

  • Create a secure, cost-effective, and scalable serverless data API
  • Use identity management and authentication for a user-specific and secure web application
  • Go beyond traditional web hosting to explore the full range of cloud hosting options

Description

Over the last few years, there has been a massive shift from monolithic architecture to microservices, thanks to their small and independent deployments that allow increased flexibility and agile delivery. Traditionally, virtual machines and containers were the principal mediums for deploying microservices, but they involved a lot of operational effort, configuration, and maintenance. More recently, serverless computing has gained popularity due to its built-in autoscaling abilities, reduced operational costs, and increased productivity. Building Serverless Microservices in Python begins by introducing you to serverless microservice structures. You will then learn how to create your first serverless data API and test your microservice. Moving on, you'll delve into data management and work with serverless patterns. Finally, the book introduces you to the importance of securing microservices. By the end of the book, you will have gained the skills you need to combine microservices with serverless computing, making their deployment much easier thanks to the cloud provider managing the servers and capacity planning.

Who is this book for?

If you are a developer with basic knowledge of Python and want to learn how to build, test, deploy, and secure microservices, then this book is for you. No prior knowledge of building microservices is required.

What you will learn

  • Discover what microservices offer above and beyond other architectures
  • Create a serverless application with AWS
  • Gain secure access to data and resources
  • Run tests on your configuration and code
  • Create a highly available serverless microservice data API
  • Build, deploy, and run your serverless configuration and code
Estimated delivery fee Deliver to Malta

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Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Mar 29, 2019
Length: 168 pages
Edition : 1st
Language : English
ISBN-13 : 9781789535297
Category :
Web Development
Languages :
Python
Concepts :
Microservices
Tools :
AWS

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Publication date : Mar 29, 2019
Length: 168 pages
Edition : 1st
Language : English
ISBN-13 : 9781789535297
Category :
Web Development
Languages :
Python
Concepts :
Microservices
Tools :
AWS

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Building Serverless Microservices in Python
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Table of Contents

7 Chapters
Serverless Microservices Architectures and Patterns Chevron down icon Chevron up icon
Serverless Microservices Architectures and Patterns
Understanding different architecture types and patterns
Virtual machines, containers, and serverless computing
Overview of microservice integration patterns
Communication styles and decomposition microservice patterns
Serverless computing in AWS
Setting up your serverless environment
Summary
Creating Your First Serverless Data API Chevron down icon Chevron up icon
Creating Your First Serverless Data API
Overview of security in AWS
Securing your serverless microservices
Building a serverless microservice data API
Setting up Lambda security in the AWS Management Console
Creating and writing to a NoSQL database called DynamoDB using AWS
Creating and writing to a NoSQL database called DynamoDB using Python
Creating a Lambda to query DynamoDB
Setting up the API Gateway and integrating it with a Lambda proxy
Connecting API Gateway, Lambda, and DynamoDB
Cleaning-up
Summary
Deploying Your Serverless Stack Chevron down icon Chevron up icon
Deploying Your Serverless Stack
An overview of serverless stack build and deploy options
Creating a profile, an S3 bucket, IAM policies, and IAM roles resources
Building and deploying with API Gateway, Lambda, and DynamoDB
Summary
Testing Your Serverless Microservice Chevron down icon Chevron up icon
Testing Your Serverless Microservice
Unit testing your Python Lambda code
Running and debugging your AWS Lambda code locally
Integration testing using real test data
The AWS Serverless Application Model CLI
Loading and end-to-end testing at scale
Strategies to reduce the API's latency
Cleaning up
Summary
Securing Your Microservice Chevron down icon Chevron up icon
Securing Your Microservice
Overview of the security in AWS
Overview of AWS Identity and Access Management (IAM)
Securing your serverless microservice
Summary
Summary and Future Work Chevron down icon Chevron up icon
Summary and Future Work
Book summary
Future work
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Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
(5 Ratings)
5 star 20%
4 star 20%
3 star 20%
2 star 20%
1 star 20%
User Sep 16, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Found this is a really good book to get me up and running with Serverless in AWS using Python, wish it were bit longer. Really like how the author introduces microservice architecture theory, with practical examples I can use and the in-depth and hands-on section on many forms of testing.
Amazon Verified review Amazon
Amazon Customer May 06, 2019
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
best for aws users trying to learn python scripting
Amazon Verified review Amazon
Andres G. T. Jul 25, 2020
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
It has a good intro to microservices concepts and good practice with lambda. However, if you plan to follow the exercises you may find it difficult. For example, sometimes the code it's repetitive and the author doesn't explain why, or he doesn't tell you that, after writing some python scripts, you have to run them locally first before running a test for a lambda function in AWS. Also, the GitHub site for the book is hard to find the code for the corresponding section in the book (at the least in the Kindle edition).
Amazon Verified review Amazon
Rob Shearer Apr 08, 2021
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
This can't really be called a "book". It's a tutorial, where you follow the directions given to create an AWS serverless service. There is a brief description of what each command does, but very little discussion of why or what other approaches are possible. Many of the steps are literally "cut and paste this code into the box".The real issue is that even as a tutorial it's atrocious. The quality of the code itself wouldn't pass muster in any serious programming team. There seems to be no rhyme or reason to what is abstracted or parameterized, leading to code that is overcomplicated and verbose while providing no real value for reuse. But it's also terribly written for a tutorial. When code from one step is expanded with a little bit of additional functionality in the next step, that isn't added as a few extra lines of code; instead the entire code is arbitrarily rewritten with slightly different function names for no obvious reason. There was clearly no intention of readers ever actually "working through" the tutorial by coding it up themselves (and experimenting with variations), only cutting and pasting.I wish I had the knowledge to comment on whether the tutorial genuinely offers modern best practice for developing serverless applications. I don't. But the author's obvious lack of any production software engineering expertise or experience does not inspire confidence.That this "book" was pushed out the door in this state must be taken as a reflection of its publisher. Based on this book, I will make sure not to waste money on any other Packt releases in the future.
Amazon Verified review Amazon
utente Sep 09, 2019
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
Terribile. È scritto coi piedi. Sembra il risultato di una persona a cui è stato detto che dovrebbe scrivere un libro, e ha buttato giù quattro appunti. Termini usati senza definirli, o con la definizione dopo il primo utilizzo. Frasi senza capo ne coda. Mi sono fermato quando ho visto una immagine in bianco e nero con la spiegazione: "I rettangoli in verde indicano i servizi...". QUesto genere di libri distruggono la fiducia in un autore e in una casa editrice. Non li conoscevo prima, li eviterò in seguito. Mi spiace perchè l'argomento mi interessava davvero :-(
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About the author

Profile icon Takashi Freeman
Takashi Freeman
Richard Takashi Freeman has an M.Eng. in computer systems engineering and a Ph.D. in machine learning and natural language processing from the University of Manchester, UK. He is currently a lead big data and machine learning engineer at JustGiving; and a cloud architect, serverless computing, and machine learning freelance SME and consultant at Starwolf. He previously worked at PageGroup and Capgemini, and has been delivering cloud-based, big data, machine learning, serverless, and scalable solutions for over 14 years across different sectors. He is a blogger; a speaker, presenting at various events; and the author of two video courses. You can visit his website, titled Richard Freeman, PhD, for his blog posts, presentations, and courses.
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FAQs

What is the delivery time and cost of print book? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela