To know whether your coins arrived or not, you can know in 2 ways:

1. Check the BUYFIFACOINS.com account on the "Delivery History" to see whether your order is completed or not. If it is completed, then you can log in to your game account to check.

2. Check the email box that you used to log in to BUYFIFACOINS.com. If your coins had been successfully transferred, you’ll receive a notification email. That means your coins had all arrived.