Is there a subscription plugin?

Question

PHP

Good afternoon, tell me a solution for WP to access a file for a one-time fee or all files by subscription for several days for a different price
Ideally, a solution like on this site https://freeopencart.ru/access-subscription

Answer 1

First, your code is terrible. It's easier to rewrite.
Second, practice speaking your thoughts correctly. No philologist will understand your incoherent text.
I re-read the problem about 20 times and, if I understand correctly, you just need to display the picture, substituting the airline code:
PS Are you sure that outputting a sentence with a specific index (12) is the correct solution?
The position and, accordingly, the index may change.