How to integrate Yola with a billing solution that would work through API with Plesk?
The Plesk WBB extension has been designed to work with Plesk Service plans. As such, any billing system that integrates with Plesk and provisions Plesk Service plans, should be compatible with WBB. See the installation guide for more details regarding the procedure of mapping WBB plans to Plesk Service plans: https://www.plesk.com/extensions/web-business-builder
Yola API for a billing solution is available here: