Creates a new coupon.
When creating a coupon, the specification object must contain values for name, code, startTime,
and either scope or minimumSubtotal. The exception is for a freeShipping coupon type, for which you cannot apply
a scope and minimumSubtotal is optional.
The coupon scope defines the items a coupon applies to. A coupon can apply to all items in a specific Wix application,
a group within the application, or a single item within a group.
See valid scope values.
The specification object must also contain a value for exactly 1 of the following coupon properties.
This defines the coupon type.
"moneyOffAmount""percentOffRate""freeShipping""fixedPriceAmount""buyXGetY"You can only call this method when authenticated as a Wix app or Wix user identity.
Coupon to create.
ID of the newly created coupon.
This method doesn’t return any custom errors, but may return standard errors. Learn more about standard Wix errors.