Delivery dependent
on the purchase amount

You need to set up a regular shipping cost in your shop's shipping settings. Additionally you can also determine the delivery cost depending on exceeding the indicated threshold or thresholds of the order amount.

First case: the delivery cost is set to PLN 0 after exceeding the threshold of PLN 500, so if the order is placed for PLN 1,000, then the delivery cost will be PLN 0 despite the regular cost of PLN 15

Second case: PLN 30 is set after exceeding the threshold of PLN 500, so if an order is placed for PLN 1,000, then the delivery cost will be PLN 30 despite the regular cost of PLN 15

Depending on your individual business model, you can set many thresholds, defining the delivery cost many times up or down.