Revoke Issuer

Revoke an issuer authorization in the Vault contract via signed XDR or direct inputs.

POST /vault/revoke_issuer

• Signed XDR flow: { signedXdr: string } → 201 { tx_id: string }

• Direct flow: { owner: string; issuer: string; vaultContractId: string } → 201 { tx_id: string }

• Validation errors: owner_required, issuer_required, vaultContractId_required

• Errors: 400 bad_request, 500 revoke_error

• Source: api/testnet/src/controllers/vaultRevokeIssuerController.ts:4-41