curl --request GET \
  --url https://api.firma.dev/functions/v1/signing-request-api/workspace/{workspace_id}/email-templates \
  --header 'Authorization: <api-key>'

{
  "results": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "email_type": "signing_invite",
      "subject": "<string>",
      "body": "<string>",
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z"
    }
  ],
  "workspace_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}