public static AirlineCheckinTemplateBuilder addAirlineCheckinTemplate(
			String introMessage, String locale, String pnrNumber,
			String checkinUrl) {
		return new AirlineCheckinTemplateBuilder(introMessage, locale,
				pnrNumber, checkinUrl);
	}
public static AirlineCheckinTemplateBuilder addAirlineCheckinTemplate ( String introMessage , String locale , String pnrNumber , String checkinUrl ) { return new AirlineCheckinTemplateBuilder ( introMessage , locale , pnrNumber , checkinUrl ) ; }
Adds an Airline Checkin Template to the response.

@param introMessage
the message to send before the template. It can't be empty.
@param locale
the current locale. It can't be empty and must be in format
[a-z]{2}_[A-Z]{2}. Locale must be in format [a-z]{2}_[A-Z]{2}.
For more information see<a href=
"https://developers.facebook.com/docs/internationalization#locales"
> Facebook's locale support</a>.
@param pnrNumber
the Passenger Name Record number (Booking Number). It can't be
empty.
@param checkinUrl
the url for the checkin. It can't be empty.
@return a builder for the response.
@see <a href=
"https://developers.facebook.com/docs/messenger-platform/send-api-reference/airline-checkin-template"
> Facebook's Messenger Platform Airline Checkin Template
Documentation</a>