Quote from a mod:
Hey, the cash withdraw process may take up to 2 business days to complete. If you want to contact our support team, please, contact them at support@gameflip.com, thanks!
Your April 30 cash out worked instantly, but the May 1 one takes longer maybe because of the anti-fraud system saw the frequent cash outs as suspicious, or it’s just that the delay is random, but at most 2 days. Anyway it’s still not over 2 business days yet, so if you still don’t see your money by then, contact that email or private message a moderator your invite code.