You can use https://nowpayments.io/ which is a noncustodial crypto payment service with support of dozens of coins and tokens. You can easily create invoices, payment buttons or use the api to build your custom solution.
My quarantine side project is a Moodle SAAS, which will offer free moodle hosting with the ability to install any moodle plugins. Current offerings do not allow users on free tier to install additional plugins or custom themes. It still very early, but I appreciate your feedback and comments. https://xeted.com/