When we have customers from countries that require visa to visit Turkey, we prepare and send a "Visa Invitation Letter". However, such letters are sent after getting official course confirmation letter followed by advance payment.

Once we agree to send you "Visa Invitation Letter", you will be sent a link to fill your passport details.

FYI, Turkish Embassy, Consular Section calls us to verify if we send such letters to avoid fake/false use of our official documents.