When we ask for your ID (or identification) number, it's referring to the unique number of the document you're uploading during the verification process.
If you receive a message that says your ID number already exists in our system, it's most likely because you've already opened a different account using that same ID. We only allow users to have one Coinmama account, and if we detect you've opened more than one, we'll have to block all but the original account.
If you're sure you haven't already opened a Coinmama account, contact our support team and we'll look into it.
Not sure which IDs Coinmama accepts? We've listed them here!