Can I use coupons issued by Japanese shopping sites on AniMeEon?

No. AniMeEon processes orders using its own accounts when purchasing from Japanese sites.
Therefore, coupons that are personally issued to you by Japanese shopping sites cannot be applied on AniMeEon.

Even if a coupon is issued to the AniMeEon purchasing account by a Japanese site, AniMeEon will not apply or use such coupons during the purchase process.