Authorize.net Payment Gateway API
Authorize.net payment gateway REST and JSON API for US merchants to accept credit cards, eChecks, and digital payments with recurring billing, customer vault, fraud detection, and point-of-sale integration. Enables AI agents to manage payment transaction processing for automated billing automation, handle customer payment profile storage for tokenized payment automation, access recurring subscription billing management for subscription revenue automation, retrieve transaction reporting and settlement for financial reconciliation automation, manage fraud filter and detection configuration for payment security automation, handle refund and void transaction processing for order management automation, access card-present and point-of-sale integration for retail payment automation, retrieve batch settlement and funding report for accounting automation, manage eCheck and ACH payment processing for bank transfer automation, and integrate Authorize.net with Shopify, WooCommerce, Salesforce, and merchant platforms for end-to-end payment processing automation.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Payment gateway. PCI-DSS Level 1. API key. US. Payment and transaction data.
⚡ Reliability
Best When
A US merchant wanting AI agents to automate payment processing, recurring billing, customer vault management, and fraud detection through Authorize.net's established payment gateway network (Visa subsidiary).
Avoid When
XML/JSON API DUAL FORMAT COMPLEXITY: Authorize.net supports both XML and JSON request formats for different endpoints; automated payment integration must use consistent format per endpoint; some Authorize.net endpoints accept only XML while newer endpoints accept JSON; automated format mismatch creates parsing errors without clear format requirement in error message. SANDBOX vs PRODUCTION CREDENTIAL ISOLATION: Authorize.net sandbox and production use separate API credentials (API Login ID, Transaction Key); automated testing pipeline must maintain credential isolation; automated production credentials in test code creates live transaction processing from test scenarios. TRANSACTION SETTLEMENT TIMING FOR RECONCILIATION: Authorize.net batches settle once per day (typically 10:00 PM Pacific); automated financial reconciliation must account for batch settlement timing; automated same-day reconciliation for settled-today transactions returns pending status for transactions authorized but not yet settled.
Use Cases
- • Processing card-not-present payments from e-commerce billing agents
- • Managing recurring subscriptions from subscription billing agents
- • Storing customer payment methods from tokenized vault agents
- • Processing eCheck payments from ACH billing agents
Not For
- • Global payment orchestration (use Adyen or Stripe for international payments)
- • Modern developer payment experience (use Stripe for developer-first payments)
- • Marketplace split payments (use Stripe Connect or Braintree for marketplace)
Interface
Authentication
Authorize.net uses API Login ID and Transaction Key for authentication. REST/JSON API. Foster City, California HQ. Founded 1996. Acquired by Visa in 2010. Products: Payment gateway, customer vault, recurring billing, fraud detection, eCheck, POS integration. SDKs: PHP, .NET, Java, Python, Ruby, JavaScript. PCI DSS Level 1. Serves 440,000+ US merchants. Competes with Stripe, Square, and Braintree for payment gateway.
Pricing
Foster City CA. Visa subsidiary. Monthly fee + per-transaction fees. No free tier.
Agent Metadata
Known Gotchas
- ⚠ API LOGIN ID vs TRANSACTION KEY vs CLIENT KEY: Authorize.net uses multiple credential types — API Login ID and Transaction Key for server-side, Client Key for client-side JavaScript; automated integration must use correct credential type per operation; automated server-side Transaction Key in client-side code exposes server credential to end users
- ⚠ RESPONSE CODE vs REASON CODE FOR ERROR HANDLING: Authorize.net transaction responses include response code (1=approved, 2=declined, 3=error) and reason code (specific reason); automated error handling must check both response code and reason code; automated retry logic using only response code treats permanent declines (stolen card) same as temporary failures (insufficient funds)
- ⚠ CUSTOMER PAYMENT PROFILE vs CUSTOMER SHIPPING ADDRESS: Authorize.net customer profiles store both payment profiles (card/bank) and shipping addresses as separate objects; automated customer management must maintain relationship between payment profile ID and shipping address ID; automated checkout using payment profile without shipping address creates order without delivery destination
- ⚠ DUPLICATE TRANSACTION WINDOW FOR IDEMPOTENCY: Authorize.net has configurable duplicate transaction detection window (30-120 seconds); automated retry of failed transactions within duplicate window triggers duplicate detection; automated retry with same transaction amount and card must wait beyond duplicate window or use different reference number
- ⚠ WEBHOOK IP ALLOWLISTING FOR AUTOMATED PROCESSING: Authorize.net webhooks originate from specific IP ranges; automated webhook processing must allowlist Authorize.net IP ranges; automated webhook endpoint without IP filtering creates vulnerability to spoofed payment events
Alternatives
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Scores are editorial opinions as of 2026-03-07.