On a mission to make software licensing more accessible, we have recently improved our Web API to make integrations with other services easier. For example, we have made it possible to return license keys as plain text, which many third party platforms require.
When selling software, there are two problems that need to be solved: payment processing and software licensing. Cryptolens core has always been the comprehensive licensing API. If you are using SendOwl or DPD, you can keep using them for payments and Cryptolens for software licensing.
If you have a new project, I would recommend to check out our new tutorial about built-in recurring payments and payment forms.