Shopee allows the application of up to three vouchers n a single checkout, which are:
You cannot stack more than 1 of each main voucher type. For example, you will not be able to use a shop and product voucher from Sellers at the same time.
You can find and choose the relevant vouchers to be used in each checkout. If you have multiple vouchers that can be used in a single checkout, you can see the differences in savings by trying out different vouchers before the checkout.