Authorizations
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
Body
application/json
PlanId
addonParams
apply promo credit or not
apply promo credit amount, auto compute if not specified
DiscountCode
Email, either ExternalUserId&Email or UserId needed
ExternalUserId, unique, either ExternalUserId&Email or UserId needed
Is free or not for the first period, true or false
GatewayId
Gateway Payment Type
Quantity
TaxPercentage,1000 = 10%
trial_end, utc time
UserId
VatCountryCode, CountryName
VatNumber

