| Merchant | Domain | Country | Program Approval |
|---|---|---|---|
| oliveandcrate.com | Not Listed | Open | |
| oo-software.com | Multiple | Open | |
| oneill.com | Multiple | Open | |
| oreilly.com | Multiple | Open | |
| ostore.com.br | Not Listed | Open | |
| omaymaskin.com | Not Listed | Open | |
| onsclothing.com | Multiple | Open | |
| orgskincare.com | Not Listed | Open | |
| o2.co.uk | Multiple | Open | |
| o2online.de | Multiple | Open |