Kassy you understood what I wanted to explain?

@moebius
Do you mean different sources charge different fees, so we need to charge differently? But that would be unfair for our users.
Please just let me know if I misunderstood you.
Thank you!

@Kassy
If you pay via the Google Play store, then there is a price lower than a year on your site. Did you know about it, so specially made?

@Kassy
doit.im - 20$
play.google.com - here the price is below 20$. This is not what I want, but now it pays so! Did you know about it, so specially made?

@moebius Thank you so much!

We set the original price as 20$. I guess you're not in the USA. And if you're not in the USA, you may still see the US Dollar currency, but that price is the one that has been automatically converted from the price of your own currency, which is the price converted with a fixed rate from 20 US Dollar. It's a bit complicated to explain, for example, the set price is 20 US Dollar, but in another country, say, in Russia, the price would be automatically shown as 1328.46 Russian Ruble (not exactly, it's my example), then when you choose to pay in US Dollar, it would be converted again with an exchange rate, so maybe what you see is 19.70 US Dollar or 20.30 US Dollar.

I don't know if I have explained clearly enough.
If still any problem, please feel free to contact us.
Thank you again for your care about us!
Have a good day!

@Kassy
You again did not understand me, go now to Google Play and pay a one-year subscription to the service. And you will see with your own eyes that there is a price bug!

@Kassy
"1328.46 Russian Ruble"
And now the price is 750 rubles per year, which is about 11.27$.