curl --request POST \
--url https://app.weesend.com/api/v1/contactBooks/{contactBookId}/contacts \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"email": "<string>",
"firstName": "<string>",
"lastName": "<string>",
"properties": {},
"subscribed": true
}
'