curl --location --request POST '/api/download/submit-all?utm_source&utm_medium&utm_campaign' \
--header 'Content-Type: application/json' \
--data-raw '{
"languageCode": "fr",
"contact": {
"firstName": "Marie",
"email": "marie@example.com"
}
}'{
"downloadUrl": "/api/download/eyJhbGciOiJIUzI1NiJ9...",
"booksCount": 12
}