From the policy.

Only payment methods offered at eBay checkout are allowed.

Activity that doesn't follow eBay policy could result in a range of actions including for example: administratively ending or cancelling listings, hiding or demoting all listings from search results, lowering seller rating, buying or selling restrictions, and account suspension. All fees paid or payable in relation to listings or accounts on which we take any action will not be refunded or otherwise credited to your account.

https://www.ebay.com.au/help/payment-methods-policy/policies/payment-methods-policy?id=4269&st=3&pos...