Ratepay Ratepay is a payment processing platform that allows online merchants to offer various payment methods to their customers, including installment plans and invoice payments. It's primarily used by e-commerce businesses in Germany, Austria, and Switzerland to facilitate online transactions. Official docs: https://developers.ratepay.com/ Ratepay Overview - Payment Request - Merchant Configuration - Payment Schedule - Refund - Settings Working with Ratepay This skill uses the Membrane CLI to interact with Ratepay. Membrane handles authentication and credentials refresh automatically — so…