There are two ways to pay a balance due:
1. You will receive an email from the organizer. The email will have a big button "Pay Balance Due". Just click on the button, login to your WeTravel account and you will be redirected to the payment page for your balance due.
2. You can at anytime login to wetravel.com and pay your balance there. Click on "My Trips". Then click on "Manage Booking"
Then click on "Pay Balance Due" on the upper right corner
You are now on the payment page to pay your outstanding balance.
Select a saved payment method or enter a new one and click "Confirm Booking"
Congrats, you just paid your balance due :)