Sandbox Test Cards

# 1. Create a sandbox transaction. The request has NO card fields — it is the same body as
#    on the Transaction API page (sign it as shown on the Authentication page; SIGNATURE, TIMESTAMP
#    and NONCE are computed as in the cURL example on the Testing page).
curl -X POST "https://sandbox-gateway.epayse.com/api/v1/transaction/create" \
  -H "Content-Type: application/json" \
  -H "X-Api-Key-Id: $API_KEY_ID" \
  -H "X-Signature: $SIGNATURE" \
  -H "X-Timestamp: $TIMESTAMP" \
  -H "X-Nonce: $NONCE" \
  -H "X-Signature-Version: 3" \
  -d '{"ref":"ORDER-1001","amount":100.5,"currency":"USD","websiteUrl":"https://example.com","redirectUrl":"https://example.com/payment/success","cancelUrl":"https://example.com/payment/cancel","description":"Premium subscription - monthly","customerDetails":{"firstName":"John","lastName":"Doe","email":"[email protected]","country":"US","ip":"203.0.113.10","phoneCode":"US","phoneNumber":"5551234567"}}'

# 2. The response contains data.checkoutUrl. Open https://sandbox-gateway.epayse.com + that path in a
#    browser and enter a test card on the checkout page:
#      Card number   4242 4242 4242 4242    (success test card — see the table above)
#      Expiry        12/36
#      CVV           123