Message content to send
Message type (determines SMS or email)
MSISDN (international format), Alias or email address
Country code ISO 3166-2 (e.g.: FR, US, MA)
Language code ISO 639-1 (e.g.: fr, en, es)
Billing UUID. Prefix with "dvp4m:" if necessary
Atom offer ID
Site label
Service URL
Template ID for email sending (provided by DV)
User service login
User service password
Token URL for authentication. Required if no login/password and type="welcome"
User account reference
Mobile operator code
Force the use of a specific driver (e.g.: D2, SFR, NRJ, DVM)