Creating custom web APIs

Let's go ahead and create a miniature, yet full-blown Magento module Magelicious_Boxy that demonstrates the entire flow of creating a custom web API.

We start off by defining a module <MAGELICIOUS_DIR>/Boxy/registration.php as follows:

\Magento\Framework\Component\ComponentRegistrar::register(
    \Magento\Framework\Component\ComponentRegistrar::MODULE,
    'Magelicious_Boxy',
    __DIR__
);

We then define the <MAGELICIOUS_DIR>/Boxy/etc/module.xml as follows:

<config>
    <module name="Magelicious_Boxy" setup_version="2.0.2"/>
</config>

We then define the <MAGELICIOUS_DIR>/Boxy/Setup/InstallSchema.php that adds the following table:

$table = $setup->getConnection()
  ->newTable($setup->getTable('magelicious_boxy_box'))
  ->addColumn(
    'entity_id',
    \Magento...