curl --request POST \
  --url http://localhost:3500/v1/recipients/{id}/merge \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "source_ids": [
    "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  ]
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({source_ids: ['3c90c3cc-0d44-4b50-8888-8dd25736052a']})
};

fetch('http://localhost:3500/v1/recipients/{id}/merge', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "http://localhost:3500/v1/recipients/{id}/merge"

payload = { "source_ids": ["3c90c3cc-0d44-4b50-8888-8dd25736052a"] }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{
  "target": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "name": "<string>",
    "organization_number": "<string>",
    "org_country": "<string>",
    "email": "<string>",
    "website": "<string>",
    "address": {
      "street": "<string>",
      "city": "<string>",
      "state": "<string>",
      "postal_code": "<string>",
      "country_code": "<string>"
    },
    "domain": "<string>",
    "relationships": {
      "invoice_count": 1,
      "agreement_count": 1,
      "pending_alert_count": 1,
      "blocking_invoice_count": 1,
      "blocking_agreement_count": 1,
      "can_delete": true
    },
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z"
  },
  "workflow_run_ids": [
    "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  ],
  "merged_ids": [
    "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  ],
  "affected_agreement_ids": [
    "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  ],
  "invoices_moved": 1
}

{
  "error": {
    "code": "validation_error",
    "message": "Invalid request format, parameters, or body. Details contain up to 20 actionable field errors; the complete encoded request body must be at most 2 MiB (2,097,152 bytes).",
    "request_id": "req_example"
  }
}

{
  "error": {
    "code": "invalid_token",
    "message": "Missing or invalid bearer credential.",
    "request_id": "req_example"
  }
}

{
  "error": {
    "code": "forbidden",
    "message": "Access denied: forbidden, token_disabled, organization_required, insufficient_role, or mfa_required. Check the error code and effective permissions.",
    "request_id": "req_example"
  }
}

{
  "error": {
    "code": "not_found",
    "message": "The resource does not exist in the current organization.",
    "request_id": "req_example"
  }
}

{
  "error": {
    "code": "conflict",
    "message": "Concurrent relationship changes. No partial merge is committed.",
    "request_id": "req_example"
  }
}

{
  "error": {
    "code": "rate_limit_exceeded",
    "message": "The IP or authenticated credential exceeded its request limit.",
    "request_id": "req_example"
  }
}

{
  "error": {
    "code": "internal_error",
    "message": "Unexpected server failure. Include the request ID when contacting support.",
    "request_id": "req_example"
  }
}

{
  "error": {
    "code": "service_unavailable",
    "message": "Authentication infrastructure is unavailable or rate limited. Honor Retry-After when provided.",
    "request_id": "req_example"
  }
}