curl -X POST https://restapi.fax.plus/v3/webhooks \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json' \
  -H 'Authorization: Bearer {access-token}' \
  -d '{
    "url": "https://example.com/fax-webhooks",
    "filter_types": ["fax_sent", "fax_received"],
    "channels": ["+12135550123"]
  }'

import requests

resp = requests.post(
    "https://restapi.fax.plus/v3/webhooks",
    headers={"Authorization": "Bearer {access-token}", "Content-Type": "application/json"},
    json={
        "url": "https://example.com/fax-webhooks",
        "filter_types": ["fax_sent", "fax_received"],
        "channels": ["+12135550123"],
    },
)
print(resp.status_code)

{}

{
  "error": "bad_request",
  "description": "Invalid number: not-a-number"
}

{
  "error": "plan_not_eligible"
}

{
  "error": "bad_request",
  "description": "application not found, enable webhooks in Fax.Plus integrations settings"
}

{
  "error": "server_error",
  "description": "server_error"
}