1. Log-in to your GoG account, either on browser or in GoG client, then browse the game you want to buy. We used the client for this guide.
2. Click Add to cart then click Check out now.
3. Select Paypal in Payment Details then click the Pay with PayPal button.
4. PayPal login window will appear. Login with your PayPal account.
5. On PayPal checkout window, select PayPal Balance then click the Pay Now button.
6. You will be prompted with Order completed succesfully and your newly bought game will be added to your Owned games.
Check our guides on how to buy games on different gaming client.