The e-Visa application for Tajikistan is straightforward.
A photo of the information page of the applicant's passport is required during the application.
The payment of 50 USD is done during the application.
Official Tajikistan e-Visa Application
The web site states that a download link to the Visa will be provided as soon as the application is completed and the payment is made. This is not always the case and may take several days for the visa to be processed.
Once the visa is approved it will be emailed to the applicant as a PDF file which can then be printed.