Which GST should be charged?

Query 


Mr. X (Registered in Haryana) Sold goods through eCommerce to Mr. Y who's located in "America".


Y has placed an order some item from website.

X has packed the item and handed over to Mr.Z DHL courier (who's                             Registered in Haryana).


Which GST should be charged by Mr. Z to Mr. X on the Tax Invoice for their courier services?

 

Note: Mr. X and Mr. Z both having the GST no. of Haryana.