If you pay an invoice via Bancontact to a supplier that's not (yet) directly connected with POM, in your bank statements you'll find the transaction listed towards WWW.POM.BE (as soon as we receive a payment confirmation, the amount is immediately transferred to the beneficiary's account). Currently, no extra details are provided in the bank statement communication. This is a known issue however: the payment service provider is working to fix this as soon as possible.
When you pay via Sign2Pay, you warrant Sign2Pay to execute the payment to the recipient and to collect the transferred amount from your account. Therefore, it is these last transactions that you will find in your account statements. With the use of the details (date, amount, recipient and statement) you can easily recognize to which document a payment is connected.