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For merchants doing custom development, Authorize.Net offers multiple methods of direct Integration to the Gateway. These are for merchants NOT using a pre-integrated Shopping Cart or POS.
Here is a link to the Developer Playbook.
Here is a link to the Developer API Reference Guide.
Authorize.Net offers toll-free technical support at 877.447.3938 and supports more Shopping Carts and Point of Sale solutions than any other payment gateway.
Included:
NO Set Up Fees
NO Cancellation Fees
FREE Tech Support
FREE Virtual Terminal
FREE Online Reporting
FREE Recurring Billing
FREE Invoicing
FREE Tokenization CIM
FREE Developer APIs
FREE Cart Integration
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