Hi.. Ebay does have a 21 day payment hold on new sellers, high risk transactions and sellers are not allowed to circumvent by asking for other payment methods.
Here is Ebay's accepted payment policy..
http://pages.ebay.ca/help/policies/accepted-payments-policy.html
If you agree to use Interac you lose Buyer Protection.
Tell seller its PayPal or cancel the transaction. Could send the above link.