PHP 7+ Payment processing library. It offers everything you need to work with payments: Credit card & offsite purchasing, subscriptions, payouts etc. - provided by Forma-Pro

PHP SDK for Authorize.Net API

Cheatsheet of test payment cards for various payment gateways

.Net SDK for Authorize.Net API

Authorize.Net driver for the Omnipay payment processing library

Java SDK for Authorize.Net API

Authorize.net CIM, AIM, and ARB Functions for Go Language

Payment abstraction library - one interface for multiple payment processors ( inspired by Ruby's ActiveMerchant )

Library that abstracts Authorize.Net's JSON APIs. This includes the Advanced Integration Method (AIM), Automated Recurring Billing (ARB), Customer Information Manager (CIM), Transaction Reporting, Simple Integration Method (SIM), and Webhooks.

Magento 2 Authorize.net CIM

Omnipay 3.x implementation of Authorize.Net API

MyAdmin Authorize.Net CreditCard Payments Plugin

Value objects for construction Authorize.Net messages

Authorizenet integration for Rails

AuthorizeNet DotNetCore Implementation

A php application with javascript form validation, which integrates with USA ePay or Authorize.net for users to donate.

Authorize.Net Native Clojure Client

authorize.net SDK for go

Go Language Authorize.Net client by examples

The Authorize.net integration from PowerSync is a fully PCI compliant solution, which allows merchants to accept payments in Magento through the use of their platform.

YII2 Authorizenet Gateway Extensions