Client API documentation

Build payment experiences on Payflow.

Payflow gives product teams one programmable layer for sandbox and production payments, hosted checkout, embedded card components, ACH bank transfers, routing outcomes, provider callbacks, request IDs, and production-safe client API credentials.

Open the docsStart with curl
Client API
POST/client/v1/payments
curl "https://api.ftosllc.co/client/v1/payments" \
  -H "Authorization: Bearer sk_sandbox_..." \
  -H "Idempotency-Key: order_1024" \
  -d '{
    "amount": 8400,
    "currency": "USD",
    "reference": "order_1024"
  }'
ResponseCheckout session createdpayflowReference: pf_sandbox_9K2...
NextRedirect or embedcheckoutUrl returned

Where integrations usually start

Make the first API call

Create a sandbox payment from a server using a secret key, inspect the response envelope, and hand the checkout URL to your client.

Read guide

Choose an integration flow

Compare hosted checkout, embedded card components, and ACH transfers before picking the right path for your client experience.

Read guide

Secure keys and origins

Understand publishable keys, secret keys, CORS origin checks, server-only flows, and safe launch practices.

Read guide