[Deprecated] The PayPal REST SDK provides Ruby APIs to create, process and manage payment. It is recommended to use paypal-server-sdk instead

PayPal Express Checkout API Client for Instance, Recurring and Digital Goods Payment.

This library is meant to interface with PayPal's Adaptive Payment Gateway.

Server-side Ruby implementation of the x402 protocol providing Rack middleware to require payments and a facilitator client for verify/settle flows. Supports the 'exact' scheme across EVM and Solana networks.

This gem generates UPI QR codes for payments. It can be used in e-commerce applications to generate QR codes for payments. The QR codes can be scanned by UPI apps to make payments. The gem uses the rqrcode gem to generate the QR codes.

The gem abstracts away the low-level details of the API, providing a simple and intuitive interface for sending payment requests, checking payment status, and managing payment callbacks

The Payments API file handles creating and processing payments, including card authorization, fraud checks, and settlements

Creates buttons to manage paying with amazon payments. Can be used for direct payments or merchant payments

Server-side Ruby client for the Wire unified payment gateway: payment intents, charges, events, and webhook endpoints across Mongolian payment operators, with automatic retries, idempotency, cursor auto-pagination, and webhook signature verification.

Rails Payment Sandbox helps developers test payment flows locally without hitting real gateways. It simulates Stripe, Razorpay, PayPal, and provides fake transactions with random statuses.

Payment library seeking to make payment interactions simple and reusable.

CIC Payment is a gem to ease credit card payment with the CIC / Credit Mutuel banks system. It's a Ruby on Rails port of the connexion kits published by the bank.

CPS (Complete Payment Systems) card payment service API in Ruby

Adds Alipay Payment as a Payment Method to Spree Commerce

Implemention of Payments Initiation (ISO 20022)

Authorize.Net SDK includes standard payments, recurring billing, and customer profiles

Robokassa is payment system, that provides a single simple interface for payment systems popular in Russia. If you have customers in Russia you can use the gem. The first thing about this gem, is that it was oribinally designed for spree commerce. So keep it in mind.

A library to interface with Fawry's payment gateway API (charge, refund, payment status, service callback).

Integration with polish payment method: Przelewy24

Client for ReCharge Payments recurring payments API for Shopify