1. Intent
The merchant API creates one payment intent. The same idempotency key returns the same intent.
Noble Shelf Limited · Hong Kong
Knowledge Craft
One cashier. Every attempt on the ledger.
Buyers pick a method. This staging service asks Stripe, then PayerMax when the first answer is a soft decline, and writes both attempts down. It does not hold funds, it is not a PSP, and it does not replace checkout on knowledge-craft.com.
Sandbox catalogue
These titles are fixtures. Paying opens the cashier with a real payment intent on the local ledger. Choose Brazil to trip the default geo allow list, the blocked sample buyer to trip the blocklist, or Archive Residency to trip the amount cap.
2. Method
The buyer picks card, AlipayHK, or WeChat Pay. Routing, not the buyer, picks the PSP order.
3. Ledger
Each try stores the processor, response code, and whether a backup was used.
Sandbox cards
Any future expiry and any 3-digit CVC. The CVC never leaves the browser.
- 4242 4242 4242 4242Stripe approves. One attempt.
- 4000 0000 0000 0002Stripe soft-declines do_not_honor. PayerMax approves. Cascade recovery.
- 4000 0000 0000 9995Both processors soft-decline insufficient_funds. Payment fails.
- 4000 0000 0000 0069Stripe hard-declines expired_card. Cascade does not run.
- 4000 0000 0000 3220Stripe requires sandbox 3-D Secure, then approves.
- 4000 0000 0000 0119Stripe processing_error, then PayerMax issuer_unavailable. Both soft. Fails.
- 5555 5555 5555 0341Stripe approves. Put PayerMax first in routing to see risk_reject.
Merchant API
curl -X POST http://127.0.0.1:43123/api/v1/payment-intents \
-H "Authorization: Bearer $CASHIER_API_KEY" \
-H "Idempotency-Key: $(uuidgen)" \
-H "Content-Type: application/json" \
-d '{"amount":12800,"currency":"HKD","description":"Field Notes on Attention","customer":{"email":"reader@example.com","country":"HK"}}'