curl --location --request POST 'https://api.sandbox.supersign.com.br/v4/api/envelopes//send' \
--header 'Idempotency-Key: 7d3f1c52-9a4b-4e6d-8f20-5b1c9e3a7d41' \
--header 'Authorization: Bearer <token>'{
"error": {
"code": "BAD_REQUEST",
"message": "Envelope has no participants"
}
}