ye know whats the greatest thing about this? it only ever happens if you are to recieve money
sold a car? sorry no money for you cause r* cant get their crap together

took part in a free roam event? sorry no money for you cause r* cant get their crap together

did an entire heist? sorry no money for you cause r* cant get their crap together
but never ever in the entire history of gta online has a transaction ever failed if you are trying to pay for something
in that case the only thing that happens you pay and then the game decides nah i have no will to live and crashes
your money will be gone but you will not have aquired whatever it is you paid for