It's nice to see another post from you, luc

I can definitely help explain the process of printing monthly statements for QuickBooks Payments (credit card payment transactions).

Here's how: 

1. Log into the Merchant Service Center.
2. Go to Activity & Reports - Transactions.
3. Select the date and click on Search.
4. Click on the transaction ID.
5. Select View Receipt.
6. Select Print.

Then, you will be able to print both a merchant or customer copy of the receipt. 

For more information about printing a statement for QuickBooks Payment transactions, you can check out this article: https://community.intuit.com/articles/1294851. 

The above steps should help you print the monthly statements. If you need more help with this, please let me know.