Hello and thank you for contacting the Toolset support.
Actually, that' the only way we offer to charge users for subscribing or submitting posts. It requires WooCommerce and our integration plugin, Toolset Forms Commerce https://toolset.com/download/toolset-cred-commerce/
CRED has been rebranded "Toolset Forms", it is our plugin that lets users submit posts and users from the frontend. You can filter our documentation for courses about Post Forms and User Forms. hidden link
- https://toolset.com/course-lesson/
If you still need any information, let us know and we'll do our best to help.
I frankly do not know any specific developer, but you can check our partners and their skills on our partners page. You can use more filters to search hidden link https://toolset.com/contractors/