Yes, you can build courses and integrate with Plungpaid to sell courses. You can also use Integrately, Pabbly connect etc. to use other payments methods to automatically give access to the academy after the successful payment.
Check these links:
If you want to sell specific courses inside an academy, you can use Group feature to provide limited access to specific courses and on successful payment, users can be added automatically to these groups.
Let us know if you have any questions