When you sell products on eBay, and if you have to collect shipping charges from the buyer, it is important that you state all these charges in the beginning of the transaction.

The greatest benefit of stating all your charges and fees at the start is that you get a positive feedback. 

You can also improve your feedback with constant communication with the buyers as this gives them comfort and peace of mind. When sending your invoice to the buyer, you could make it personal with a note. 

On shipping out the merchandise, send a confirmation message to the buyer, even if you don’t have any tracking number to provide.

In addition to all this, you have to send a follow up message to the buyer to ensure that the item had reached them and to ensure that they were happy with the product.