Cash on delivery at a parcel locker is deliberately strict, because a parcel that reaches the locker unpayable comes back at your cost. When a condition fails the rate simply disappears, with no error at checkout. Check these in order.
The badge on the Parcel locker cash on delivery (COD) card, on the General tab of Settings, reads Off: one of the two fields on it is still empty.
The badge reads Needs check: the rate you saved is no longer among your Shopify rates for this market, so pick it again.
The customer has not chosen a pickup point yet. The rate appears only after they do.
The chosen point does not take payments. Try the same cart with another point.
The chosen point is an ORLEN Paczka one. Cash on delivery is InPost only.
The cart is over 5000 PLN, which is the InPost cap for a single cash on delivery shipment.
The cart contains a subscription line. Shopify does not allow a manual payment method on such a cart.
If none of the above explains it, read Hide pickup delivery for heavy, cheap or specific orders: a hidden pickup rate takes cash on delivery with it.
A cart priced in another currency keeps the rate at checkout, but its label is refused: cash on delivery is PLN only.
Over your monthly pickup order limit the effect is the opposite: the rate is offered on every cart, even with no point chosen. Pause it in Shopify until you are back under the limit.
Stuck on any of this? Open the chat in the bottom right corner of the app and we will help you set it up.
