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Guides

Guides

Step-by-step guides for building on VelPay. For every field and endpoint, see the API reference.

Start#

QuickstartKeys, test mode, your first order, a simulated payment, going live.
WebhooksHeaders, raw body, signature checks in Node, PHP and Python, retries, dedupe, replay, local testing.
TestingTest keys, simulating paid, partial and expired orders, test refunds, a checklist before launch.

Payment methods#

Crypto paymentsNetworks and coins, quotes, underpayment tolerance, late payments, presetting a coin.
Cash App paymentsHow payers pay over Lightning, limits, invoice expiry, refunds.
Card paymentsThe third-party on-ramp, what the payer sees, limits, refunds.

Integrations#

Reference#

Errors and rate limitsError shape, what to retry, Retry-After, idempotent retries.

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