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Square POS Hardware Onboarding Merchant Discovery Payment Fundamentals Pricing Residuals Underwriting High-risk Chargebacks Fraud Gateways Integrations APIs Testing Ecommerce Settlement Agent Programs Merchant Services Unit Economics Payment Terminology

Build a Provider Capability Matrix Before Writing Payment Code

Evaluate payment APIs with documented operations, availability conditions, test evidence and named owners. Keep supported, conditional, unknown and unavailable capabilities distinct.

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