Bill Me Later is an ebay.com option available to USA based buyers. Canadian buyers cannot use it.
A Canadian seller can have their item bought on eBay.com by USA based buyers. The seller does not offer the Bill Me Later. The eBay.com offers this service automatically.
The seller gets paid in total as a normal transaction and the sale is a normal sale. The buyer is obligated to pay the payments when due by the Bill Me Later service. If they do not, the Bill Me later service collects. The seller has nothing to do with the Bill Me Later service. Bill Me Later extended the credit and the buyer agreed to it. The seller has full Seller Protection on the sale. The seller's involvement in the Buyer using Bill Me Later does not exist.
A seller cannot turn on the Bill Me Later service on their own not can they turn it off. eBay determines which items and which buyers can see the option in the listing. eBay extends the credit through their PayPal Bill Me Later service.
Basically it is like a credit card and the seller has nothing to do with the paying of the credit.
That is my understanding of Bill Me later when I researched it a few months ago for a similar question on this.
Here is a link to Bill Me Later, A PayPal service.
http://pages.ebay.com/billmelater10back/
Notice the late fee of $25 to $35 for a missed monthly payment. Ouch!
