Payoneer requires a government-issued photo ID for verification purposes, and unfortunately, the National Identification Number (NIN) slip is not considered an acceptable form of ID. This is because the NIN slip is a temporary document that doesn't have a photo of the holder, which is a key requirement for verification. To complete the verification process, you will need to provide a copy of your passport, driver's license, or another government-issued photo ID. You can check Payoneer's support page for more information on the accepted forms of ID. I know it can be frustrating to have your NIN slip rejected, but it's important to remember that Payoneer is following strict guidelines to ensure the safety and security of their users.