I need algorithm, or PHP api example, or existing decision how to make system for trade big information for B2B xml with goods information. Now I try to use

Slim framework

to do that system. But for me need some documentation what architecture have to be in here. System requiments is simple:

1. User have autentification username and password
2. Then he can see which product groups assigned to it
3. Then he can see all product with information (price, title, description, images, specifications etc.).

Its will the easiest way to get a free php api for that I think, and try too edit some code. But I did not found anything.