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TLS 1.0 and 1.1 will be Disabled in Sandbox on April 30, 2017

See our blog post for more details: https://community.developer.authorize.net/t5/The-Authorize-Net-Developer-Blog/TLS-1-1-and-1-0-Disabl...

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Webhooks are now available for Authorize.Net

Using SOAP, see our deprecation notice.
Check out Accept.js, our Javascript replacement for DPM.
Pro Tip: Never use test mode in the sandbox, instead use the Testing Guide.