How can i pay for this tool?

How can i pay for this tool? There is an error, and i cant pay for that tool. =(
I was trying different browsers - there is same result. I use MacBook Pro.

Possibly try a different browser, there have been multiple purchases in the last hour, so there doesn't seem to be a general problem.

I tried google chrome and safari last versions. what browsers do i need to try next?)

These should all work. Maybe some network or firewall issue? Where are you located?