# Update the reference account of a credit line

Updates the external reference account associated with a customer's credit line. The account is used for the payout of a credit line loan.

Endpoint: PATCH /v1/persons/{person_id}/credit_lines/{credit_line_id}/reference_account
Version: 1.0

## Path parameters:

  - `person_id` (string, required)
    The person ID of the customer who has the credit line.

  - `credit_line_id` (string, required)
    The unique credit line ID, generated after a credit line is created.

## Request fields (application/json):

  - `iban` (string, required)
    The IBAN of the external reference account to be linked to the credit line.
    Example: "DE87110101001000057123"

  - `mandate_number` (string, required)
    The mandate number.
    Example: "LUUJZMGP2IWIIE"

  - `mandate_signature_date` (string, required)
    The date on which the mandate was signed.
    Example: "2022-02-07"

  - `name` (string,null)
    The name of the account holder.
    Example: "Lisa Hermann"

## Response 400 fields (application/json):

  - `code` (string)
    Example: "build_pagination_headers_failure"

  - `detail` (string)
    Example: "Cannot connect to database."

  - `id` (string)
    Example: "a95f2aaf-4e0c-4d49-8021-8a16a884ed86"

  - `status` (string)
    Example: "400"

  - `title` (string)
    Example: "Failed to build pagination headers."

## Response 403 fields (application/json):

  - `code` (string)
    Example: "unauthorized_action"

  - `detail` (string)
    Example: "Unauthorized action is not allowed."

  - `id` (string)
    Example: "a95f2aaf-4e0c-4d49-8021-8a16a884ed86"

  - `status` (string)
    Example: "403"

  - `title` (string)
    Example: "Unauthorized Action"

## Response 404 fields (application/json):

  - `code` (string)
    Example: "model_not_found"

  - `detail` (string)
    Example: "Couldn't find 'Account' for id 'DE24112233445566'."

  - `id` (string)
    Example: "a95f2aaf-4e0c-4d49-8021-8a16a884ed86"

  - `status` (string)
    Example: "404"

  - `title` (string)
    Example: "Model Not Found"

## Response 409 fields (application/json):

  - `title` (string)
    Example: "Record Not Unique"

  - `status` (string)
    Example: "409"

  - `id` (string)
    Example: "a95f2aaf-4e0c-4d49-8021-8a16a884ed86"

  - `detail` (string)
    Example: "Could not save `terms_and_conditions_event`."

  - `code` (string)
    Example: "record_not_unique"

## Response 422 fields (application/json):

  - `errors` (array, required)

  - `errors.id` (string, required)
    A UUID, preferably the request ID

  - `errors.status` (integer, required)
    The HTTP status

  - `errors.code` (string, required)
    some_computer_friendly_string

  - `errors.title` (string, required)
    Some short human friendly string

  - `errors.detail` (string, required)
    Some human friendly-ish detail: field is required

  - `errors.backtrace` (array,null)
    Optional array of backtrace lines

  - `errors.source` (object,null)
    Optional computer-friendly error source description
    Example: {"field":"name","message":"is_required"}

  - `errors.source.field` (string, required)
    Example: "name"

  - `errors.source.message` (string, required)
    Example: "is_required"