curl --location '/api/v1/sign/pdf' \
--header 'Content-Type: application/json' \
--data '{
"document_id": "b792e8ae-2cb4-4209-85b9-32be4c2fcdd6",
"content_base64": "string"
}'{
"success": true,
"data": {
"document_id": "b792e8ae-2cb4-4209-85b9-32be4c2fcdd6",
"signed_content_base64": "string"
}
}