curl --request POST \
  --url https://api.sandbox.tesouro.com/finops/v1/receivables/{receivable_id}/decline \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'x-finops-version: <x-finops-version>' \
  --header 'x-organization-id: <x-organization-id>' \
  --data '
{
  "comment": "The quote was declined for some reasons"
}
'

{
  "success": true
}