The first step is to register on our sandbox https://sandbox.billwerk.com/#/signup This is our test environment, where you can learn to handle the billwerk platform. Configure your settings, set up your products and some test customers and start testing on the sandbox. If you want, you can create demo products and test customers in "Settings > Administration > Create Demo Data".
For the customer order process, you have got the opportunity to use our hosted signup page or to build your own page using our billwerkJS. You can use webhooks to inform your system about upcoming events like a fulfilled signup, or failed payments.
When your test system is running as expected, go to our website https://billwerk.com/en/prices/ , select the wanted plan and register for the productive account. Now you can configure your settings in the produtive environment. If you want to test on the productive system, be sure to annulate all contracts in the end. Now you can start using billwerk.
If you need any help configuring your account, please feel free to contact our support by mail: firstname.lastname@example.org
A summary of the basic concept and integration options can be found here: https://developer.billwerk.io/Docs/GettingStarted