Creates a new SMS campaign and sends messages to all recipients. Recipients can be provided as an array, raw text, or from an existing contact book.
Campaign name
"Summer Promo"
Message content
"Get 20% off this summer!"
Sender ID
"ECSEND"
Array of phone numbers
["+25884000001", "+25884000002"]Comma or newline separated phone numbers
"+25884000001,+25884000002"
Name of existing contact book to use
"My Contacts"