API Name: Update Token

API Suite: UPI 1.0 (Acceptance) – OneStack & UPI 2.0 – NPCI

Owner: Bank CBS / OneStack

Consumer: OneStack

• Objective

  The Update Token API enables OneStack to associate a unique customer token with each CRN (Customer Reference Number) in the Bank CBS. This token acts as a persistent identifier for subsequent UPI API calls, ensuring secure and consistent linkage of UPI transactions to the correct customer record.

  This API is called once at the time of registration.

  • OneStack generates a 36-character alphanumeric token for every CRN.
  • Token is stored in CBS and reused across all further API interactions.
  • Ensures seamless mapping between OneStack and Bank CBS identifiers.
  • Provides idempotent behavior (same CRN-token mapping cannot be overwritten accidentally).
  • Tokens are immutable; regeneration requires explicit bank + OneStack authorization.

• UPI 1.0 - OneStack (Acceptance Only) + UPI 2.0 - NPCI