curl --request POST \
  --url https://api.luminpdf.com/v1/signature_request/send-from-template \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "template_id": "<string>",
  "title": "<string>",
  "signers": [
    {
      "email_address": "<string>",
      "name": "<string>",
      "signer_role": "<string>",
      "verification": {
        "payload": {
          "claims": []
        }
      }
    }
  ],
  "expires_at": 123,
  "tags": {},
  "fields": {},
  "variables": {},
  "viewers": [
    {
      "email_address": "<string>",
      "name": "<string>"
    }
  ],
  "custom_email": {
    "sender_email": "<string>",
    "subject_name": "<string>",
    "title": "<string>"
  }
}
'

{
  "signature_request": {
    "signature_request_id": "<string>",
    "created_at": "<string>"
  }
}