If you plan to use myCred, ask also for this on their support.
You can try this plugin: https://wordpress.org/plugins/thecartpress/ and if you’re comfortable with php, i recommand you to experiment a bit this plugin with upcoming BP 2.4 on a local install.
Thought if the plugin hold what it promise on the description, it would be a piece of cake to intagrate it with 2.4.
Other solution is woocommerce, but it’s a big plugin. Basically, you need just a few CPT and a good tutorial explaining how to install a simple e-store on WordPress.
