Your spend limit is shown on the home screen of the app. The spend limit is determined by QuadPay and may vary for each customer.
You can make multiple purchases, but the spend limit will be reduced by the full amount of your order until an installment is paid back. Each paid installment will increase your available balance by that amount.
The fastest way to increase your spend limit is to pay back your installments early. You can do this by tapping an order under the orders tab and tapping the “Pay Early” button.