---
title: "Attach Documents to Associated Party V2"
method: POST
path: "/v2/customers/{customer_id}/associated-parties/individual/attach"
tags: ["Customers"]
---

# Attach Documents to Associated Party V2

`POST /v2/customers/{customer_id}/associated-parties/individual/attach`

Attach identifying documents and address documents for one or more associated parties of a business customer. Replaces the v1 proof_of_identity / proof_of_address structure with separate identifying_documents and address_documents arrays, allowing multiple ID documents per party.

## Path parameters

- `customer_id` string, uuid, required

## Request body

- AttachDocumentsToAssociatedPartyV2Input
  - `associated_party_attachments` V2AssociatedPartyAttachment[], required — Array of document attachments, one entry per associated party. Multiple parties can be submitted in a single request.
    - `associated_party_id` string, uuid, required — Unique identifier for the associated party, returned in GET /v2/customers/:customer-id.
    - `identifying_documents` V2IdentifyingDocumentAttachment[] — Government-issued identity documents for this party. Multiple documents may be provided (e.g., passport + driver license). NATIONAL_ID and DRIVERS_LICENSE require both FRONT and BACK sides.
      - `type` 'PASSPORT' | 'NATIONAL_ID' | 'DRIVERS_LICENSE' | 'RESIDENCE_PERMIT' | 'PERMANENT_RESIDENCY_ID', required — Type of government-issued identity document. At least one identifying document is required. Double-sided documents must include both front and back images. **USA residents**: all ID types are supported: - `PASSPORT`: Passport - `NATIONAL_ID`: National ID card - `DRIVERS_LICENSE`: Driver's license - `PERMANENT_RESIDENCY_ID`: Permanent Residency / Green Card **Non-USA residents**: only the following are accepted: - `PASSPORT`: Passport - `NATIONAL_ID`: National ID card - `DRIVERS_LICENSE`: Driver's license `PERMANENT_RESIDENCY_ID` is **not supported** for non-USA residents and will be rejected.
      - `number` string, required — Document number.
      - `country` 'AFG' | 'ALB' | 'DZA' | 'ASM' | 'AND' | 'AGO' | 'AIA' | 'ATA' | 'ATG' | 'ARG' | 'ARM' | 'ABW' | 'AUS' | 'AUT' | 'AZE' | 'BHS' | 'BHR' | 'BGD' | 'BRB' | 'BLR' | 'BEL' | 'BLZ' | 'BEN' | 'BMU' | 'BTN' | 'BOL' | 'BES' | 'BIH' | 'BWA' | 'BVT' | 'BRA' | 'IOT' | 'BRN' | 'BGR' | 'BFA' | 'BDI' | 'CPV' | 'KHM' | 'CMR' | 'CAN' | 'CYM' | 'CAF' | 'TCD' | 'CHL' | 'CHN' | 'CXR' | 'CCK' | 'COL' | 'COM' | 'COD' | 'COG' | 'COK' | 'CRI' | 'HRV' | 'CUB' | 'CUW' | 'CYP' | 'CZE' | 'CIV' | 'DNK' | 'DJI' | 'DMA' | 'DOM' | 'ECU' | 'EGY' | 'SLV' | 'GNQ' | 'ERI' | 'EST' | 'SWZ' | 'ETH' | 'FLK' | 'FRO' | 'FJI' | 'FIN' | 'FRA' | 'GUF' | 'PYF' | 'ATF' | 'GAB' | 'GMB' | 'GEO' | 'DEU' | 'GHA' | 'GIB' | 'GRC' | 'GRL' | 'GRD' | 'GLP' | 'GUM' | 'GTM' | 'GGY' | 'GIN' | 'GNB' | 'GUY' | 'HTI' | 'HMD' | 'VAT' | 'HND' | 'HKG' | 'HUN' | 'ISL' | 'IND' | 'IDN' | 'IRN' | 'IRQ' | 'IRL' | 'IMN' | 'ISR' | 'ITA' | 'JAM' | 'JPN' | 'JEY' | 'JOR' | 'KAZ' | 'KEN' | 'KIR' | 'PRK' | 'KOR' | 'KWT' | 'KGZ' | 'LAO' | 'LVA' | 'LBN' | 'LSO' | 'LBR' | 'LBY' | 'LIE' | 'LTU' | 'LUX' | 'MAC' | 'MDG' | 'MWI' | 'MYS' | 'MDV' | 'MLI' | 'MLT' | 'MHL' | 'MTQ' | 'MRT' | 'MUS' | 'MYT' | 'MEX' | 'FSM' | 'MDA' | 'MCO' | 'MNG' | 'MNE' | 'MSR' | 'MAR' | 'MOZ' | 'MMR' | 'NAM' | 'NRU' | 'NPL' | 'NLD' | 'NCL' | 'NZL' | 'NIC' | 'NER' | 'NGA' | 'NIU' | 'NFK' | 'MNP' | 'NOR' | 'OMN' | 'PAK' | 'PLW' | 'PSE' | 'PAN' | 'PNG' | 'PRY' | 'PER' | 'PHL' | 'PCN' | 'POL' | 'PRT' | 'PRI' | 'QAT' | 'MKD' | 'ROU' | 'RUS' | 'RWA' | 'REU' | 'BLM' | 'SHN' | 'KNA' | 'LCA' | 'MAF' | 'SPM' | 'VCT' | 'WSM' | 'SMR' | 'STP' | 'SAU' | 'SEN' | 'SRB' | 'SYC' | 'SLE' | 'SGP' | 'SXM' | 'SVK' | 'SVN' | 'SLB' | 'SOM' | 'ZAF' | 'SGS' | 'SSD' | 'ESP' | 'LKA' | 'SDN' | 'SUR' | 'SJM' | 'SWE' | 'CHE' | 'SYR' | 'TWN' | 'TJK' | 'TZA' | 'THA' | 'TLS' | 'TGO' | 'TKL' | 'TON' | 'TTO' | 'TUN' | 'TUR' | 'TKM' | 'TCA' | 'TUV' | 'UGA' | 'UKR' | 'ARE' | 'GBR' | 'UMI' | 'USA' | 'URY' | 'UZB' | 'VUT' | 'VEN' | 'VNM' | 'VGB' | 'VIR' | 'WLF' | 'ESH' | 'YEM' | 'ZMB' | 'ZWE' | 'ALA', required — ISO 3166-1 alpha-3 country code
      - `issue_date` string, date, required — Document issue date in YYYY-MM-DD format.
      - `expiry_date` string, date, required — Document expiry date in YYYY-MM-DD format. Must not be expired.
      - `files` object[], required — One or more file URIs from [Upload Document](https://developer.fin.com/api-reference/customers/upload-document) endpoint. For NATIONAL_ID and DRIVERS_LICENSE, provide both FRONT and BACK.
        - `side` 'FRONT' | 'BACK' — Required for NATIONAL_ID and DRIVERS_LICENSE. Optional for PASSPORT and RESIDENCE_PERMIT.
        - `uri` string, required — File URI returned by the upload endpoint.
    - `address_documents` V2AddressDocumentAttachment[] — Proof of address documents. Must be issued within the last 90 days.
      - `type` 'UTILITY_BILL' | 'GOVERNMENT_LETTER' | 'BANK_STATEMENT' | 'PROOF_OF_TAX_IDENTIFICATION' | 'COURT_DOCUMENT' | 'INSURANCE_STATEMENT', required — Type of address proof document. Must be within the last 90 days.
      - `files` object[], required — One or more file URIs from [Upload Document](https://developer.fin.com/api-reference/customers/upload-document) endpoint.
        - `uri` string, required — File URI returned by the upload endpoint.
    - `supporting_documents` V2AssociatedPartySupportingDocumentAttachment[] — Any additional supporting documents for this party. Optional. Pass empty array if not applicable.
      - `type` 'MILITARY_ID' | 'MATRICULATE_ID' | 'STATE_OR_PROVINCIAL_ID' | 'VISA' | 'OTHER', required — Type of additional supporting document for the associated party.
      - `files` object[], required — One or more file URIs from [Upload Document](https://developer.fin.com/api-reference/customers/upload-document) endpoint.
        - `uri` string, required — File URI returned by the upload endpoint.

## Response `200`

Documents attached successfully

- object
  - `data` object — Generic response object

## Other responses

- `400` — Validation failed
- `401` — Authentication failed due to invalid credentials
- `404` — Resource not found
- `422` — Failed due to a formatting error.

---

[API](https://skmtc.net/fin/apis/fin-com-api.md) · [All operations](https://skmtc.net/fin/apis/fin-com-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/fin/fin-com-api/revisions/6e69503ee7b8/schema)