> For the complete documentation index, see [llms.txt](https://docs.ur.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ur.app/api-reference/api/kyc-and-kyb/managed-custody-kyc/sign-form-a.md).

# Sign Form A

UR's TurnKey wallet signs Form A on the user's behalf after the user consented in your UI; you prove that authorization by echoing the textHash from form-a-info. Returns FORMA\_TEXT\_MISMATCH (code 20005) if the stored text changed since the last render; re-call form-a-info and resign with the new hash. The returned state stays SignFormA; only submit advances the session.

```json
{"openapi":"3.1.0","info":{"title":"UR API","version":"1.0.0"},"tags":[{"name":"Managed Custody KYC","description":"SDK KYC and shared-token KYC reuse for Managed Custody Mode."}],"servers":[{"url":"https://openapi.ur.app","description":"Production (partner API)"},{"url":"https://uropenapi-qa.ur-inc.xyz","description":"Testnet (partner API)"}],"security":[{"partnerAuth":[]},{"userWalletAuth":[]}],"components":{"securitySchemes":{"partnerAuth":{"type":"apiKey","in":"header","name":"X-Api-Signature","description":"Partner Auth: EIP-191 signature by the partner's registered backend key, with X-Api-Deadline and optional X-Api-PublicKey headers. See the Signature and verify guide."},"userWalletAuth":{"type":"apiKey","in":"header","name":"sign","description":"User wallet auth (External Wallet Access Mode): EIP-191 signature by the user's wallet key, with tokenId, network, hash, and deadline headers. See the Signature and verify guide."}},"schemas":{"KycSignFormRequest":{"type":"object","required":["sessionId","textHash"],"properties":{"sessionId":{"type":"string","description":"The onboarding session UUID returned by create-account."},"textHash":{"type":"string","description":"The textHash from the latest form-a-info render. Must match the current render or the call fails with FORMA_TEXT_MISMATCH (code 20005)."}}},"KycSignFormResponse":{"type":"object","properties":{"code":{"type":"integer","description":"Business result code. 0 means success; business rejections return HTTP 200 with a non-zero code."},"message":{"type":"string","description":"Human-readable diagnostic for non-zero codes."},"data":{"type":"object","properties":{"state":{"type":"string","description":"Still SignFormA after a successful sign; only submit advances the session."},"signature":{"type":"string","description":"Hex signature over the Form A text, produced by the UR-managed wallet."},"signerAddress":{"type":"string","description":"The UR-managed TurnKey wallet that signed. Equals the evmAddress from create-account."}}}}}}},"paths":{"/api/fma/v1/kyc/sign-form":{"post":{"tags":["Managed Custody KYC"],"operationId":"kycMcSignForm","summary":"Sign Form A","description":"UR's TurnKey wallet signs Form A on the user's behalf after the user consented in your UI; you prove that authorization by echoing the textHash from form-a-info. Returns FORMA_TEXT_MISMATCH (code 20005) if the stored text changed since the last render; re-call form-a-info and resign with the new hash. The returned state stays SignFormA; only submit advances the session.","parameters":[{"name":"X-Ur-Id","in":"header","required":false,"schema":{"type":"string"},"description":"The user's URID. Send at least one of X-Ur-Id or X-External-User-Id."},{"name":"X-External-User-Id","in":"header","required":false,"schema":{"type":"string"},"description":"Your partner-side user id. Send at least one of X-Ur-Id or X-External-User-Id."},{"name":"X-Api-Signature","in":"header","required":true,"schema":{"type":"string"},"description":"Partner Auth EIP-191 signature over the canonical message plus the deadline."},{"name":"X-Api-Deadline","in":"header","required":true,"schema":{"type":"string"},"description":"Unix timestamp in seconds after which the signature is no longer valid."},{"name":"X-Api-PublicKey","in":"header","required":true,"schema":{"type":"string"},"description":"Partner public key used to verify the signature."}],"requestBody":{"required":true,"content":{"application/json":{"schema":{"$ref":"#/components/schemas/KycSignFormRequest"}}}},"responses":{"200":{"description":"Business result envelope. code 0 means success; business rejections return HTTP 200 with a non-zero code.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/KycSignFormResponse"}}}}}}}}}
```


---

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