curl --request POST \
  --url https://api.sortx.co.uk/telephony/sms/threads/{id}/contact \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "contactId": "<string>",
  "expectedRevision": 123
}
'

const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({contactId: '<string>', expectedRevision: 123})
};

fetch('https://api.sortx.co.uk/telephony/sms/threads/{id}/contact', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.sortx.co.uk/telephony/sms/threads/{id}/contact"

payload = {
    "contactId": "<string>",
    "expectedRevision": 123
}
headers = {
    "x-api-key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

{
  "id": "<string>",
  "localNumber": "<string>",
  "address": "<string>",
  "contact": {
    "id": "<string>",
    "name": "<string>"
  },
  "revision": 123,
  "lastMessageAt": "<string>",
  "lastInboundAt": "<string>",
  "preview": "<string>",
  "stopped": true
}

{
  "_tag": "TenantCreateRejected",
  "reason": "<string>",
  "field": "<string>"
}

{
  "_tag": "Unauthenticated"
}

{
  "_tag": "TenantSuspended",
  "tenantId": "<string>",
  "reason": "<string>"
}

{
  "_tag": "EntitlementMissing",
  "tenantId": "<string>",
  "moduleId": "<string>"
}

{
  "_tag": "TenantNotFound",
  "slug": "<string>"
}

{
  "_tag": "WebhookDuplicate",
  "integration": "<string>",
  "externalId": "<string>"
}

{
  "_tag": "RateLimited",
  "key": "<string>",
  "retryAfterSeconds": 123,
  "message": "<string>"
}

{
  "_tag": "IntegrationUnavailable",
  "integration": "<string>",
  "detail": "<string>"
}