REST Integration

To integrate the Mollie extension with a PWA using REST, we added 2 endpoints to the normal Magento 2 checkout flow.

This is a normal flow:

• Create cart
• Add products
• Set shipping information
• Place order

When using Mollie the order flow looks like this:

• Create cart
• Add products
• Set shipping information
• Create payment token
• Place order
• Start transaction

Create a payment token

To create a payment token you should do a GET request to the applicable endpoint:

GET /V1/carts/mine/mollie/payment-token
GET /V1/guest-carts/:cartId/mollie/payment-token

This will return a random 32 character string:

TumUZulyLVk16boibN59euvSr1Quh6hR

Start transaction

Next, after placing the order, do a POST request to the endpoint with the payment token:

POST /V1/mollie/transaction/start
{
  "token": "TumUZulyLVk16boibN59euvSr1Quh6hR"
}

The response will be the redirect URL. You should redirect your user to this URL:

https://www.mollie.com/payscreen/order/checkout/rhdz9w

This page will handle the payment and redirect your user back to your webshop. By default, the URL of the Magento installation is used, but in most cases, you'll want to provide a custom URL.

You can enter one under Stores -> Configuration -> Sales -> Payment Methods -> Mollie -> General -> Use custom redirect url?.