prices_messaging.go
func (cmps *CountryMessagingPriceService) GetPage(ctx context.Context, data url.Values) (*CountriesPricePage, error) {
	return cmps.GetPageIterator(data).Next(ctx)
}
func (cmps *CountryMessagingPriceService) GetPage(ctx context.Context, data url.Values) (*CountriesPricePage, error) {
	return cmps.GetPageIterator(data).Next(ctx)
}
// returns a list of countries where Twilio messaging services are available and the corresponding URL
// for retrieving the country specific messaging prices.