> ## Documentation Index
> Fetch the complete documentation index at: https://docs.venlyfinance.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Update a party

> Update an existing party's name, VAT number, or address.

Patches only the fields you send. Include the current `version` (from a prior read); a stale `version` returns `409` so you can refetch and retry (see [Versioning](/getting-started/conventions#versioning)). `partyType` cannot be changed after creation.


## OpenAPI

````yaml api-reference/Finance-API-Specs.yaml PATCH /parties/{partyId}
openapi: 3.1.0
info:
  title: Venly Finance API
  description: >
    REST API for the Venly Finance platform:

    - Party management (Individuals & Organisations)

    - Account management with party association

    - Wallet balances & token allowances on supported chains (Base, Avalanche)

    - Virtual bank account assignment for global payments (EUR SEPA)

    - Fiat-to-crypto payment sessions (pay-in)

    - Account-to-account fiat & crypto transfers

    - EIP-2612 permits and payment requests


    ## Authentication


    All endpoints use OAuth2 client credentials. Obtain a token first, then
    include it in every request:


    **Step 1 — Get a token:**

    ```bash

    curl -X POST
    https://login.venly.io/auth/realms/VenlyFinance/protocol/openid-connect/token
    \
      -H "Content-Type: application/x-www-form-urlencoded" \
      -d "grant_type=client_credentials&client_id={CLIENT_ID}&client_secret={CLIENT_SECRET}"
    ```


    **Step 2 — Use the token:**

    ```

    Authorization: Bearer {access_token}

    ```


    Tokens expire after **5 minutes**. Implement refresh logic in your client.
  version: 1.1.0
  contact:
    name: Venly Support
    email: support@venly.io
    url: https://docs.venlyfinance.com
  license:
    name: Proprietary
  x-logo:
    url: https://venlyfinance.com/logo.png
  x-security-contact: security@venly.io
servers:
  - url: https://api.venlyfinance.com/v1
    description: Production
  - url: https://api-staging.venlyfinance.com/v1
    description: Staging
security:
  - OAuth2: []
tags:
  - name: Parties
    description: Party management (Individuals & Organisations)
  - name: Accounts
    description: Account management, party-role associations
  - name: Wallets
    description: Blockchain wallet balances
  - name: Virtual Bank Accounts
    description: Virtual bank account payment references for global payments
  - name: Fiat-to-crypto Payment Sessions
    description: Fiat-to-crypto payment session creation
  - name: Payment Requests
    description: Payment request management for card provider integrations
  - name: Transfers
    description: Fiat and crypto transfer operations between accounts
  - name: Permits
    description: EIP-712 permit signature management for token approvals
  - name: Allowances
    description: Token allowance management for wallets
paths:
  /parties/{partyId}:
    patch:
      tags:
        - Parties
      summary: Update party details
      description: >
        Updates an existing party's information. Only provided fields will be
        updated.


        **For Individuals:** Can update firstName, lastName, and address

        **For Organisations:** Can update name, vatNumber, and address


        **Optimistic locking:** You must send the current `version` of the
        party. If the

        version is stale the request fails with `409 concurrent-modification` —
        re-fetch and retry.


        **Note:** Cannot change partyType after creation. KYC/KYB status is
        managed separately.
      operationId: updateParty
      parameters:
        - $ref: '#/components/parameters/PartyId'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/UpdatePartyRequest'
            example:
              version: 0
              firstName: Janet
              lastName: Doe
      responses:
        '200':
          description: Party updated
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SinglePartyResponse'
              example:
                success: true
                result:
                  id: 7e3b9c2a-1f4d-4a8b-9c11-2d6e8f0a1b22
                  externalId: user-12345
                  partyType: INDIVIDUAL
                  status: ACTIVE
                  firstName: Janet
                  lastName: Doe
                  address:
                    addressLine1: 1 Example Street
                    city: Amsterdam
                    postalCode: 1011AB
                    country: NL
                  createdAt: '2026-01-15T09:30:00'
                  updatedAt: '2026-01-15T09:30:00'
                  version: 0
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
        '409':
          $ref: '#/components/responses/Conflict'
        '500':
          $ref: '#/components/responses/InternalServerError'
components:
  parameters:
    PartyId:
      name: partyId
      in: path
      required: true
      description: Unique party identifier
      schema:
        type: string
        format: uuid
      example: 7e3b9c2a-1f4d-4a8b-9c11-2d6e8f0a1b22
  schemas:
    UpdatePartyRequest:
      type: object
      required:
        - version
      description: >
        Update party details. Only fields applicable to the party type can be
        updated.

        For Individuals: firstName, lastName, address.

        For Organisations: name, vatNumber, address.
      properties:
        version:
          type: integer
          format: int64
          description: Current version of the party for optimistic locking
        firstName:
          type: string
          maxLength: 100
          description: First name (Individual only)
        lastName:
          type: string
          maxLength: 100
          description: Last name (Individual only)
        name:
          type: string
          maxLength: 255
          description: Organisation name (Organisation only)
        vatNumber:
          type: string
          maxLength: 50
          description: VAT number (Organisation only)
        address:
          $ref: '#/components/schemas/Address'
    SinglePartyResponse:
      allOf:
        - $ref: '#/components/schemas/BaseResponse'
        - type: object
          properties:
            result:
              $ref: '#/components/schemas/Party'
    Address:
      type: object
      description: Standardized address format used across all endpoints
      properties:
        addressLine1:
          type: string
          maxLength: 255
        addressLine2:
          type: string
          maxLength: 255
        city:
          type: string
          maxLength: 100
        state:
          type: string
          maxLength: 100
        postalCode:
          type: string
          maxLength: 20
        country:
          type: string
          pattern: ^[A-Z]{2}$
          description: ISO 3166-1 alpha-2 country code
    BaseResponse:
      type: object
      properties:
        success:
          type: boolean
          description: Indicates whether the request was successful
    Party:
      type: object
      description: |
        A party represents an Individual or Organisation that can hold accounts.
        The partyType field determines which additional fields are present.
      properties:
        id:
          type: string
          format: uuid
        externalId:
          type: string
          description: External reference ID
        partyType:
          $ref: '#/components/schemas/PartyType'
        status:
          $ref: '#/components/schemas/PartyStatus'
        firstName:
          type: string
          description: First name (Individual only)
        lastName:
          type: string
          description: Last name (Individual only)
        kycStatus:
          $ref: '#/components/schemas/KycStatus'
        name:
          type: string
          description: Organisation name (Organisation only)
        vatNumber:
          type: string
          description: VAT number (Organisation only)
        kybStatus:
          $ref: '#/components/schemas/KybStatus'
        address:
          $ref: '#/components/schemas/Address'
        createdAt:
          type: string
          format: date-time
        updatedAt:
          type: string
          format: date-time
        version:
          type: integer
          format: int64
          description: Optimistic-locking version, required when updating
    ErrorResponse:
      type: object
      description: Error response wrapper
      properties:
        success:
          type: boolean
          description: Always false for error responses
          example: false
        errors:
          type: array
          description: List of errors that occurred
          items:
            $ref: '#/components/schemas/ErrorBody'
        result:
          type: object
          nullable: true
          description: Null or omitted when success is false
    PartyType:
      type: string
      description: Type of party
      enum:
        - INDIVIDUAL
        - ORGANISATION
    PartyStatus:
      type: string
      description: Status of a party
      enum:
        - ACTIVE
        - SUSPENDED
        - BLOCKED
    KycStatus:
      type: string
      description: KYC verification status (Individuals & accounts)
      enum:
        - VERIFICATION_PENDING
        - VERIFIED
        - REJECTED
    KybStatus:
      type: string
      description: KYB verification status (Organisations)
      enum:
        - PENDING
        - VERIFIED
        - DENIED
    ErrorBody:
      type: object
      description: Individual error details
      properties:
        code:
          type: string
          description: Machine-readable error code
          example: invalid-request
        message:
          type: string
          description: Human-readable error message
          example: The request contains invalid parameters.
  responses:
    BadRequest:
      description: Request validation failed (400)
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            success: false
            errors:
              - code: invalid-request
                message: The request contains invalid parameters.
    Unauthorized:
      description: Authentication required or failed (401)
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            success: false
            errors:
              - code: unauthenticated
                message: Please authenticate to perform this action.
    Forbidden:
      description: Caller lacks the required authority/role (403)
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            success: false
            errors:
              - code: forbidden
                message: You do not have permission to access this resource.
    NotFound:
      description: Resource not found (404)
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            success: false
            errors:
              - code: account-not-found
                message: The requested resource was not found.
    Conflict:
      description: Resource conflict / optimistic-lock failure (409)
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            success: false
            errors:
              - code: concurrent-modification
                message: >-
                  This request has been modified by another user. Please refresh
                  and try again.
    InternalServerError:
      description: Unexpected server error (500)
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          example:
            success: false
            errors:
              - code: internal-error
                message: An unexpected error occurred. Please try again later.
  securitySchemes:
    OAuth2:
      type: oauth2
      description: >
        OAuth2 client credentials flow. Token endpoints:

        - Staging:
        https://login-staging.venly.io/auth/realms/VenlyFinance/protocol/openid-connect/token

        - Production:
        https://login.venly.io/auth/realms/VenlyFinance/protocol/openid-connect/token
      flows:
        clientCredentials:
          tokenUrl: >-
            https://login-staging.venly.io/auth/realms/VenlyFinance/protocol/openid-connect/token
          scopes: {}

````