Hi CeliaCheng,
Thanks for posting your questions. You should be able to post to both eBay AU and eBay US if your eBay account is primarily registered in Australia so you should not need to go through any separate eBay registration process to allow you to post items to the eBay US site.
When you are creating your listings through Auctiva, you will just want to make sure to select the correct eBay site (Australia or US) from the “eBay Site” drop down menu in the upper right corner of the listing creation page to make sure they go to the desired eBay site.
Since you received an API error message indicating that you are specifying money order as a payment method when you have not actually selected that payment method, I suspect you have some text in your description or seller details profile that refers to payment via money order. Ebay would pick up on that reference and use it as cause to reject the listing.
Once you have removed any and all references to payment via money order from your description and seller details profile, you should then be able to post any listings for which you received that API error message successfully.
If you are unable to locate the part of your listing that is causing that error to be returned, I recommend contacting our customer support team by mousing over the “Help” tab within your account and selecting the “File Support Request” option, and we should be able to help you out with that.
-Mike
