[Deprecated] The PayPal Permission SDK provides Ruby APIs for developers to request and obtain permissions from merchants and consumers, to execute APIs on behalf of them. The permissions include variety of operations from processing payments to accessing account transaction history

REST API Client for iPay payment gateway

Unofficial fork. Integrate with the Fat Zebra internet payment gateway (www.fatzebra.com.au), including purchase, refund, auth, capture and recurring billing functionality.

Solidus extension to allow payment methods to be restricted by zones

Kassa24 API wrapper (online payments)

Simple implementation for one-shot monetico payments. Generates and validates MAC parameter.

Provides Ruby SDK for AfterPay payment service provider.

Nordea::Siirto implements requests according to Nordea Siirto protocol, which enables real time payments for select Finnish bank accounts

The Bleumi Pay SDK helps you integrate Algo, Algorand Standard Asset, Ethereum, ERC-20, RSK, RSK ERC-20 & xDai payments and payouts into your business or application. The SDK bundles 'Bleumi Pay API' into one SDK to ease implementation and support.

Checkout.com payment integration.

API for sending and managing payments

Manage your professional association online. Membership categories, applications to join and reclassify, annual dues payments and more.

Adds PayPal API Checkout as a Payment Method to Spree Commerce

Affix provides an unified API to access different payment gateways in Indonesia.

Use the Tester Stripped API to manage business including payment. customer, product and inventory management.

This is the official Ruby Gem For Flutterwave Payments which includes Card, Account, Transfer, Subaccount, Subscription, Mpesa, Ghana Mobile Money, Ussd, Payment Plans, and Transfer payment methods.