[Translation from Japanese to English ] I thought I made a mistake so I've already finished the refund process. The ...

Original text

私は自分が間違いをしてしまったと思ったので、あなたに既に返金の手続きをしてしまいました。返金は○○ドルです。このお金を返してほしいです。私のショップからその金額分の商品をあなたが購入して、私はその商品を発送しません。そのようにしてくれれば、この問題は解決します。
あなたよければ以下の商品を購入してください。

Translation / English

I thought I made a mistake so I've already finished the refund process. The refund amount is $OO. I'd like you to refund this amount back. I want you to purchase the products of that amount from my shop and I won't ship the products you purchase. If you could do so, this problem would be solved.
If you don't mind doing it, please purchase the products below.

Translation / English

As I happened to have done a wrong thing, I have processed to refund the amount for you already. The total amount is ○○ dollars. I would like you to return the amount for me. If you would place an order for the price of items, I won't ship them. If you would did, the problem would be solved. If you are alight, please make a purchase for the items for following.

Translation / English

Dear OO,

I mistook to request a refund because I thought I made a mistake in the procedure.
The amount of the refund is $00. I would like to give it back . To refund fairly, I would like you to buy a product from my shop on online, and I am not going to ship the stuff. By following it, this problem can be dealt with.

If you kindly accept this solution, please choose the product and buy it.

sincerely,