Ubercart 1

Ubercart has a fairly straightforward API for processing and logging payments that is quite similar in both the 1.x and 2.x branches. As a developer, you may run into a situation where you need to make manual note of external payments or trigger the automatic processing of payments based on your business rules. In Ubercart, there is a difference between processing a payment with the function uc_payment_process() and just recording a payment with the function uc_payment_enter(). To explain the difference, you should first understand a few concepts related to the payment system in Ubercart and how payment data is displayed to customers and administrators. After covering the terms and concepts, a full description of both functions mentioned above will be given followed by a section on using the API to process credit card transactions in your own code.

The request for more robust Ubercart add to cart forms comes up fairly regularly. People generally have in mind the sort of form that allows customers to specify quantities for a set of products and add them to the cart all at once. The request came up so often that I put a short explanation on how to accomplish this through a custom form into an FAQ post on Ubercart.org.

This article will walk through a very basic example of how you can use the Ubercart function uc_cart_add_item() in a custom form submit handler to add multiple items to the cart at once. This article assumes a basic knowledge of Drupal's Forms API. Code examples are from Drupal 6, but they are mostly applicable to Drupal 5 as well.