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The developer's guide is aimed at module developers interested in extending the capabilities of Ubercart to meet their needs. Modules may be written for new payment gateways, shipping services, product types, etc. This guide will provide insight into the APIs defined in the Ubercart core modules, showing you where and how to hook into the cart. If a section is missing, feel free to suggest it in the Documentation forum! As Ubercart ages, new versions of the software will be released for different versions of Drupal. Use the following guide to know where to start: http://api.ubercart.org based on the code comments in our module files. To find help porting your modules from one version of Ubercart to the next, use the section titled Ubercart API Updates by Release.