Payments from Third Pary

Hi Experts,

I would like to know different ways to process third party payments. Here our third party sends notification file (frequency half hour) containing list of contract accounts who made payments and respective payment amount. At the end of day they send payment file containing complete list with amount. I want to post pending payment on the contract account whenever I receive notification, and will convert this pending payment to actual payment once we receive payment file. Now my question is - how do we post pending payment? is it a statistical credit? what if I want pending payment posting to obey all my payment priority rules, is it possible? Please let me know your thoughts on the same. Thanks.

Kind Regards,

Nikhil