Wordpress based Crowdfunding Coder Needed

Using a wordpress crowdfunding theme I need the ability to have the public pledge specific dollar amounts (anywhere from 1 cent to multiple dollars) per points made by a team during a game or tournament and then the ability to collect the amounts pledged after the event is over. Think "Walk-A-Thon" type of pledging such as a dollar a mile walked but ours would be specific dollar amount per points made during the tournament and then we collect after the event is over using our funding website. Example: A team is playing in a sports tournament. Weeks before the tournament the team members create there own team charity page/project on our site and then they go out and recruit a number of people/businesses to visit thier page on our website and pledge a dollar amount for every point the team gets during the tournament. This pledge of money would be donated to the designated charity. The Pledge Lets say that a person/business signs up and agrees to pledge a dollar per point. During tournament play the team produces a total of 75 points. The person/business who previously have pledged then would then be responsible for a $75 pledge for the charity the team was playing for. At this point the pledge would be collected and disbursed to the charity. The Problem I need coding that will allow us to offer teams a charity project page, give the information about the team, tournament and charity then register the pledged amount but not collect it until the tournament is over and to do so through our wordpress based website. The problem is pledges would have to be made before the tournament and the exact pledge amount owed would not be known until after the tournament is over and then the correct amount would have to be collected. The final score of the team would need to be entered through some team administration portal on our website and then once the correct amount is figured the person/business would be notified by email of the final pledge amount and the credit card billed using some payment gateway that would work with a system like this. Please let me know of any more questions you may have as well as a quote for this if it is possible.