code: public AirlineItineraryTemplateBuilder addPriceInfo(String title,
  			BigDecimal amount) {
  		PriceInfo priceInfo = new PriceInfo(title, amount);
  		this.payload.addPriceInfo(priceInfo);
  		return this;
  	}
docs: Adds a {@link PriceInfo} object to this template. This field is optional.
  There can be at most 4 price info objects per template.
  
  @param title
  the price info title. It can't be empty.
  @param amount
  the price amount.
  @return this builder.