Is it acceptable to ask addition postage after invoice sent and buyer paid

[belfastbt4]

due to large size and weight of the book, it costed more than standard?!

[catsnewwife]

I wouldn't risk it if I were you. You have no feedback as a seller yet...you don't want your first one to be a bad one! It's up to the seller to know postage costs BEFORE the items is listed. We all have made the same mistake!

[femmefan1946]

NO. Accept that we all make rookie mistakes. (And I did it too  last night, after over 5,000 sales on various IDs. I'm a slow learner.)

If you weigh and measure the book beforehand, in metric,  and used Calculated Shipping, this will not be a problem in future. Your customer will see the shipping cost to his doorstep, based on your dimensions, the service you chose, and his postal code.

Is the buyer in a location that you did not give a shipping price for? In those cases, you can charge the appropriate shipping and eBay will back you.

BTW, when you set up shipping, do add a small handling cost for packaging. Bubblewrap ain't free.