I have a little issue - and I hope you can help me out

I use a parcel service (GLS) in order to send out my parcels from Denmark to Denmark and Sweden.

I just had a Swedish customer who wanted to return a parcel, which I offered to pay for.

I then discovered that my Danish parcel service only provides parcel-labels for DKK > SWE and not the other way around.

Is there somewhere I can buy a Swedish label for a parcel on a Swedish website? It is a parcel with a volume of 100 x 80 x 5 cm and a weight of 4 kg.

Best regards