Asterisk a2billing customer web interface modification - VOIP

In order to work on this project, it is imperative that you have knowledge of a2billing for asterisk. This project is about changing the customer web frontend/interface in a2billing to match my company website brand. In addition, I need a change to be made to a flash object on my website. Knowledge of Css, php, flash, and linux is a must. In addition, we do not want any dirty code. The codes should be done in a clean fashion (include comments, etc) so it can be changed by anyone if needed. We already have some experience but do not have the time to do this work, hence why we are sub contracting it. The version of a2billing is 1.2.3. It is anticipated that this work should take no longer than 2 or 3 days. If you cannot meet the above requirements, please do not apply. Please include sample links of work done along the lines of what of the requirements above in your quote. Also, ask us as many question as you can before bidding. Payment: 60% will be paid two days after project completion and after quick check of the functionality. 40% will be paid a couple of days later after we make sure that all we asked for is there. PS: we will also be looking to integrate auto-recharge within a2billing. Any knowledge that you have of implementing this will be beneficial however, this is not a requirement for this project.