Sumsub — Create Transaction (KYT)

Builds a KytTxnData JSON payload from a compact spec, POSTs it to the Sumsub KYT endpoint, and reports the resulting txnId / score / reviewAnswer.

Endpoint

Two variants, picked automatically by the post script:

Body: KytTxnData. Returns the persisted KytTxn with monitoring scores attached.

Both endpoints are marked deprecated, but they remain the canonical "submit transaction" entry points in the official docs. No v2/v3 replacement exists.

Auth — App Token + secret (sandbox only)

This skill talks to the public Sumsub API and signs each request per the authentication reference. The full how-it-works writeup lives in the sumsub-api-auth skill — read it if you hit 401 Invalid signature.

⚠️ Sandbox tokens only. Do not accept or use a production App Token here — transaction monitoring acts on real applicant data and can fire real KYT alerts. If the user offers a prod token, refuse and ask them to generate a sandbox pair at <https://cockpit.sumsub.com/checkus/home?sbx=true> (Connect Sumsub to your AI agent -> Build & configure -> Generate token). Token + secret are shown once — copy both before closing the dialog. The helper script enforces this — it rejects tokens that don't start with sbx:.

Signing the resolved path

This is the one routing wrinkle — the path with query string must be signed. The post script handles it: it reads the sidecar route file the builder emits, picks the URI (/resources/applicants/{id}/… or /resources/applicants/-/…?levelName=…), URL-encodes the dynamic segments, and signs the same bytes it sends. If you bypass the script, remember:

• Sign the path you put on the wire — encoded form, query string included.
• Body bytes signed must equal the bytes sent (no whitespace re-flow).

If the user has already supplied credentials in conversation, reuse them; otherwise ask once before running. Never echo the secret back.

Procedure

1. Map the user's intent to the compact spec below. The vast majority of transactions are type: finance (a payment) — for those, the user is really telling you amount + currency + direction + applicant + counterparty.
2. Validate: txnId non-empty, applicant.externalUserId non-empty, and per type:

• finance / travelRule → info.amount, info.currencyCode, info.direction required (the OpenAPI marks all three required on KytTxnInfo).
• userPlatformEvent → userPlatformEvent.type required.
• Enums (direction, currencyType, applicant.type, nameType, etc.) checked upfront with full allowed-values list on failure.

1. Generate the full payload with ${CLAUDE_SKILL_DIR}/scripts/build_transaction.py (compact spec on stdin → full KytTxnData payload on stdout).
2. POST via ${CLAUDE_SKILL_DIR}/scripts/post_transaction.sh — auto-routes to existing-applicant vs non-existing-applicant URL based on whether _applicantId was set in the spec (NOT in the payload — see below).
3. Build the dashboard link. Read id (the server-assigned identifier, not the txnId you supplied) and clientId from the response body and format:

   https://cockpit.sumsub.com/checkus/kyt/txns/<id>?clientId=<clientId>&sbx=true

The user-supplied txnId in the spec (e.g. finance-2026-05-21-0001) is not what goes in the URL — Sumsub assigns a separate identifier on persistence. The sbx=true query param targets the Sandbox workspace — it is the canonical sandbox link param shared across all skills.

1. Report: txnId (yours), the server id, applicant externalUserId, direction + amount + currency, counterparty (if any), the response's score / reviewAnswer / riskLabels if present, and the dashboard link as a clickable markdown link.

Compact spec format (JSON or YAML on stdin)

# Top-level
txnId: "finance-2026-05-21-0001"     # REQUIRED, unique alphanumeric in your system
txnDate: "2026-05-21 14:30:00+0000"  # optional; format: yyyy-MM-dd HH:mm:ss+XXXX
zoneId:  "UTC+01:00"                 # optional, time zone string
type:    finance                     # finance | travelRule | kyc | userPlatformEvent | iGamingSession (default: finance)

# Routing — pick ONE
_applicantId: "67abc..."             # post to existing applicant (path id, NOT a payload field)
# - OR -
_levelName: "Default"                # post to non-existing-applicant URL with ?levelName=...
                                     # (Sumsub creates the applicant from applicant.externalUserId)

# Finance / Travel Rule info (required for those types)
amount:       1500.50
currency:     USD                    # ISO-4217 fiat or crypto ticker (BTC, ETH, …)
currencyType: fiat                   # fiat | crypto  (default: fiat)
direction:    out                    # in | out
amountInDefaultCurrency: 1500.50     # optional, converted to client default
defaultCurrencyCode:     USD
paymentDetails: "Invoice #INV-2026-001"
mcc:    5411                         # optional, 4-digit Merchant Category Code

# Crypto-only block (used when currencyType=crypto)
crypto:
  chain:        ETH                  # ETH | BTC | TRX | … (mandatory for tokens; empty for native)
  contract:     "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48"
  paymentTxnId: "0x1234abcd..."      # on-chain hash
  fingerprint:  "0x1234abcd..."      # alternative blockchain identifier
  attemptId:    "attempt-01"         # optional, when retrying
  outputIndex:  0                    # for UTXO chains

# Applicant (REQUIRED) — the person/entity acting on your platform
applicant:
  externalUserId: "user-001"         # REQUIRED — your stable user id
  type: individual                   # individual | company (default: individual)
  fullName: "John Smith"             # required for company; recommended for non-existing-applicant flow
  dob: "1990-05-01"
  email: "[email protected]"
  phone: "+1234567890"
  placeOfBirth: "London"
  address:
    country: USA
    town: "New York"
    street: "5th Avenue"
    formatted: "5th Avenue, New York, USA"
  paymentMethod:
    type: bankCard                   # bankCard | bankAccount | crypto | cryptoWallet |
                                     # eWallet | unhostedWallet | card | other
    accountId: "4111********1111"    # IBAN, last4-hash, wallet address, etc.
    issuingCountry: USA
    "3dsUsed": true
    "2faUsed": false
    memo: "optional memo"
  idDoc:
    number: "A12345678"
    country: USA
    idDocType: PASSPORT
  device:
    fingerprint: "abc123"
    userAgent: "Mozilla/5.0 ..."
    ipInfo: { ip: "1.2.3.4" }

# Counterparty (typical for finance + travelRule; same shape as applicant + a few extras)
counterparty:
  externalUserId: "merchant-XYZ"
  type: company
  fullName: "Acme Inc."
  registrationNumber: "12345678"
  leiCode: "529900XXXX0000XXXX00"
  residenceCountry: QAT
  address: { country: QAT }
  institution:                       # → institutionInfo
    code: "ACME-CODE"
    name: "Acme Bank"
    internalId: "<VASP id from directory>"
  ceo:                               # only for company counterparties (Travel Rule)
    firstName: "Jane"
    lastName: "Roe"

# user-platform-event only (when type=userPlatformEvent)
userPlatformEvent:
  type: login                        # login | failedLogin | signup | passwordReset | twoFaReset | general
  twoFaUsed: true
  passwordHash: "..."

# Optional escape hatches
sourceKey: "<segregation key>"
props:                               # custom string-string map
  customField: "value"
  dailyOutLimit: "10000"

Enums (validated upfront)

paymentMethod.type is intentionally not enum-checked — the OpenAPI lists KytTxnPaymentMethodType (only smartContract, bankCard, bankAccount) but the docs and live data accept many more (crypto, eWallet, unhostedWallet, etc.). The builder forwards whatever the caller supplies.

Outputs

On success, report all of:

• txnId (yours) and id (server-assigned, used in the dashboard link).
• Applicant externalUserId.
• direction amount currency, counterparty (if any).
• The response's score / reviewAnswer / riskLabels if returned.
• Dashboard link: https://cockpit.sumsub.com/checkus/kyt/txns/<id>?clientId=<clientId>&sbx=true. Render as a clickable markdown link. <id> is the server-assigned identifier (not the txnId you sent); both it and clientId are in the POST response body; sbx=true targets the Sandbox workspace.

On failure: HTTP status + Sumsub's description/errorName. Most likely 4xx cases:

• 409 Entity already exists — txnId collision (use a fresh id or the bulk-import method to update).
• 400 — required field missing (typical: info.amount, info.currencyCode, info.direction, or applicant.externalUserId).
• 400 — levelName unknown (when using non-existing-applicant flow).

Worked examples

• examples/fiat-out.json — outbound EUR card payment to a foreign counterparty (the docs' canonical example).
• examples/crypto-in.json — inbound ETH deposit with cryptoParams.cryptoChain=ETH, contract address, on-chain paymentTxnId.
• examples/travel-rule.json — type: travelRule outbound crypto with institution.internalId (VASP id) on the counterparty.
• examples/login-event.json — type: userPlatformEvent for a successful login with 2FA.
• examples/new-applicant.json — non-existing-applicant flow: _levelName is set so the POST goes to /-/kyt/txns/-/data with ?levelName=....

See also

• references/transaction-schema.md — full KytTxnData schema, all sub-objects, all enums, the existing-vs-new-applicant routing, scoring response fields, common gotchas.
• Sumsub docs — Submit transaction
• Sumsub docs — Submit transaction for non-existing applicant
• Sumsub docs — Submit transactions and review results