curl --request POST \
  --url https://api.robase.dev/v1/sms-templates/{id}/render \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "variables": {}
}
'

{
  "body": "<string>",
  "encoding": "GSM7",
  "segments": 123
}