Ondastreet 

Dear subscribers, if you have any problems with the payment process, please read this post. Payment errors can occur for various reasons.

1) Payment will be made only by cards where 3DS is connected (SMS with payment confirmation is sent to the phone)

2) Adblock and other extensions can also interfere with the payment process, and you should also try the browser's incognito mode or another browser where extensions are not installed.

3) If you are trying to make payments in the built-in instagram browser, etc.(where you opened the link), it is better not to do this, because built-in browser reduces functionality, it is better to open the link in a regular browser.
Regular browsers that supports boosty: Opera, Google Chrome, Mozila Firefox, Yandex browser, etc.