I bought a this extension from marketplace.magento.com. I tried to install it via composer like this:
composer require bsscommerce/customer-approval
But I get
[InvalidArgumentException] Could not find a matching version of package bsscommerce/customer-approval. Check the package spelling, your version constraint and that the package is available in a stability which matches your minimum-stability (stable).
I also followed this documentation, but it does not help.