I have customer paid invoice on 25th Dec and few others and still not showing up in quickbooks

Hi krishnatraders

Thank you for reaching out on this. 

If you have bank feed connected with your QuickBooks Online, there would be an option for you to match the payment in the banking/transaction tab to the open invoice. Please see details in the link below:

Categorise and match online bank transactions in QuickBooks Online

Thank you and please let me know if you require any additional assistance.