One of my frequent buyers of postcards (from Australia) suddenly asked me if I have changed my settings because she experienced a demand from eBay to pay instantly for the first card, and the same was for the subsequent, etc...
Before she was just buying and then I was sending her the combined invoice.
I refunded her three payments and got charged by PAYPAL 30 cents for each transaction.
I guess it was smarter to refund only the shipping cost.
Is there anything to recommend to buyers for multiple purchases in regards to one billing? (convenient for them and for me)
Thank you for recommendations.