The agenda receipt that goes to the mail after the instalment is an archive that is required uniquely to affirm that you have purchased a ticket.
You don't have to introduce it at the air terminal, all your information is now contained in the transporter's data set, and you just need a visa to check-in for the flight.
To load onto the plane, you need a ticket - you can get it at the registration counter at the air terminal, at oneself registration machine or while enlisting on the web. In the last case, the coupon will be shipped off the mail, and you can either save it to your telephone or print it out.
Something like this seems as though an agenda receipt (ticket).