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POST
/
v1
/
customers
/
associated-parties
/
individual
/
attach
Copy of 
curl --request POST \
  --url https://{base_url}/v1/customers/associated-parties/individual/attach \
  --header 'Authorization: <authorization>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "customer_id": "{{customer_id}}",
  "associated_party_attachments": [
    {
      "associated_party_id": "249aece4-4a50-4584-ba6a-ccbc63e6f76e",
      "proof_of_identity": {
        "type": "NATIONAL_ID",
        "number": "P1234567",
        "country": "BGD",
        "issue_date": "2019-07-01",
        "expiry_date": "2029-06-30",
        "files": [
          {
            "side": "FRONT",
            "uri": "{{file1}}"
          },
          {
            "side": "BACK",
            "uri": "{{file2}}"
          }
        ]
      },
      "proof_of_address": {
        "type": "BANK_STATEMENT",
        "country": "{{country_code}}",
        "files": [
          {
            "uri": "{{file3}}"
          }
        ]
      }
    }
  ]
}
'
{
  "data": {
    "customer_id": "<customer_id>"
  }
}

Documentation Index

Fetch the complete documentation index at: https://developer.fin.com/llms.txt

Use this file to discover all available pages before exploring further.

This endpoint will be deprecated on May 20, 2026. Use Attach Documents to Associated Party V2 instead.
Before calling this endpoint, upload documents using the Upload document endpoint to obtain the URIs needed for the files arrays.
This endpoint allows attaching documents for multiple associated parties in a single request.

Headers

​
Authorization
string
default:Bearer {{client_access_token}}
required

Body

application/json
​
customer_id
string
required
​
associated_party_attachments
object[]
required

Response

202 - application/json

Accepted

​
data
object