How to do combini-pay from Rakuten?

I’m used to using conbini-pay with Amazon. You buy the item off the site, it emails you a barcode you take to 7-11 and they scan it and you pay.

I just tried the same with rakuten, except… for the life of me I can’t figure out where to find the stupid barcode! I got an email… but it just shows the item I want and how much it is, no barcode, no other instructions. I’ve logged into rakuten, checked the order, it says to wait for “payment confirmed” but that seems backwards, since I can’t pay until I get the barcode!

Any ideas?