code: public static ReceiptTemplateBuilder addAirlineItineraryTemplate(
  			String recipientName, String orderNumber, String currency,
  			String paymentMethod) {
  		return new ReceiptTemplateBuilder(recipientName, orderNumber, currency,
  				paymentMethod);
  	}
docs: Adds a Receipt Template to the response.
  
  @param recipientName
  the recipient's name.
  @param orderNumber
  the order number.Must be unique for each user.
  @param currency
  the currency for the price. It can't be empty. The currency
  must be a three digit ISO-4217-3 code in format [A-Z]{3}. For
  more information see <a href=
  "https://developers.facebook.com/docs/payments/reference/supportedcurrencies"
  > Facebook's currency support</a>
  @param paymentMethod
  the payment method details. This can be a custom string. ex:
  "Visa 1234". You may insert an arbitrary string here but we
  recommend providing enough information for the person to
  decipher which payment method and account they used (e.g., the
  name of the payment method and partial account number).
  @return a builder for the response.
  @see <a href=
  "https://developers.facebook.com/docs/messenger-platform/send-api-reference/receipt-template"
  > Facebook's Messenger Receipt Template Documentation</a>