Integrating a payment gateway
A payment gateway allows you to process payments online. Using a payment gateway, you can manage customers' orders and delegate payment processing to a reliable, secure third party. You won't have to worry about processing credit cards in your own system.
There are several payment gateway providers to choose from. You are going to integrate Braintree, which is used by popular online services such as Uber and Airbnb.
Braintree provides an API that allows you to process online payments with multiple payment methods, such as credit card, PayPal, Google Pay, and Apple Pay. You can learn more about Braintree at https://www.braintreepayments.com/.
Braintree provides different integration options. The simplest is the Drop-in integration, which contains a preformatted payment form. However, in order to customize the behavior and experience of your checkout, you are going to use the advanced Hosted Fields integration...