I am interested in developing an extension to my Android app which populates the shopping cart for a web shop using SJ Mini Cart Pro.

Is there any publically accessible documentation for the AJAX requests I would need to invoke to build up a shopping cart?

I have been communicating with the web shop owner and they do not seem technically minded enough to tell me if there is any documentation and I am not sure I want to purchase the plugin just to find out

Dear sir,
Please refer this documentation:
www.smartaddons.com/documentation/sj-minicart-pro-for-virtuemart/

Thanks.