Working with a third-party API

For most payment modules, you will have to work with a third-party API. In this section, we will build a payment method on a very simple API and we will also learn how to save the transaction ID. We will use the api.php script attached to the code of this chapter. You can open it if you want to see how it works, but in summary, we need the following variables as POST values:

  • api_credentials_id: For this, in our case, we have to send the presta string value
  • id_cart: This is the cart ID
  • total_to_pay: This is the total amount of the order
  • validation_url: This is the URL that the api.php script will call to confirm that the order has been paid
  • return_url: This is the URL that the customer will be redirected to if he or she ...

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