Security & Signature

Algorithm

• SHA256withRSA
• Request signature: merchant private key
• Response signature: platform private key

Signature String Rules

1. Sort fields by ASCII.
2. Exclude sign.
3. Ignore null/empty values.
4. Flatten nested objects.
5. Join as k1=v1&k2=v2....

Common Errors

• 20052: Signature verification failed
• 10506: Validation failed
• 20023: Configuration not enabled