Graal's desktop website uses a site called "SuperRewards" for those who attempt to purchase or earn Graalats or anything, whereas Facebook uses facebook pay and mobile goes through the respective Android/Apple App Store.
I think that Graal should move to a different service for this. SR is extremely awful, does not actually reward anything upon purchase or completion of one of their "tasks", their customer service is dismissive and unresponsive, and the whole site is a borderline scam.
This is a well documented issue as well for other games/services that use this site: https://www.trustpilot.com/review/superrewards.com
Clearly a bad business and Graal would be wise to separate themselves from them