Changes

* [[UserPurchasePinValueNoMatch]] --> if user pin doesn't match or sent empty

* [[InvalidPaymentType]] --> if paymentType = Unknown || (PaymentType not in product payment types)

* [[UserDoesNotHaveMandatorySubscription]] --> If mandatory subscription is active, User has not purchase it, and user is trying to buy a product != MandatorySubscription

* [[InvalidReturnOrCancelURL]] --> if paymentType = Paypal, webpay or worldpay and returnUrl or cancelURl empty or null