Agriya GroupDeal Payment Gateway Integration needed

Dear Provider, we are a dedicated and fun team based in Germany, doing German and international/English projects. We operate the Agriya GroupDeal Script which is well written in CakePHP. The script is in English, the payment gateway and it's documentation etc. as well, though the operating customer front-end is in German and the final implementation needs to consider this, though during the implementation process, you are welcome to switch to English and finish the work there. Though the job will be complete only when the customer front-end will be working in German. WE ARE LOOKING FOR - a developer with Agriya GroupDeal script experience - and experience with integrating payment gateways (preferrably experience integrating payment gateways with the agriya groupdeal script) DETAILS - Our payment service provider is [login to view URL] [login to view URL] - We need the integration for credit card and direct debit; paypal and online transfer ("sofortueberweisung") (which is / all of which go through our PSP [login to view URL] - transfer data in XML format using HTTP POST" - You will be provided more details (full documentation, test data, login credentials to back-end, etc.) if you're interested in this job TIMEFRAME & BONUS We need the payment gateway integration done latest by June 1st. Please only bid if you are sure to meet this deadline. 20% of the agreed upon payment will be made if deadline of June 1st is met. And not paid if the job is done after June 1st. An extra 5% will be paid as a bonus (on top of the 20%) if the project is done before June 1st. For fairness to you - if the responsibility for delay lies with us, the deadline will be moved accordingly to the delay we have caused. (e.g. login credentials we have provided not working, you needing to wait for a needed response to continue your work more than 24h...) To technically organize this most easily, we suggest the following: 80% of the amount agreed upon (100%) will be the project budget 20% will be paid as a bonus if project is finished by June 1st Another 5% will be paid as bonus if the project is done before June 1st OPPORTUNITIES FOR YOU This is a one-time job with a fixed amount. But, we >are< looking for a developer for our groupdeal-project to do more customizations we need for sure already (though will look at that only after the payment gateway integration has been done) and a developer for irregular (or regular) ongoing work with this project. After timely successful implementation of the payment gateway and mutual satisfying cooperation, you will be offered more customization work. REQUIREMENTS Please go through the list of tasks and requirements carefully. I won't respond to proposals which don't answer the following questions: - When you could start - Willingness to sign NDA - Please provide examples of your past work with the agriya groupdeal script and with integrating payment gateways Because of possible extra effort which might be needed on your part of needing to have the frond-end in German and possible difficulties that could arise with that, we have estimated a budget of $250-$350 instead of the usual $200-$250 for a job like this. Looking forward to hearing from you and hopefully welcoming you to our team Simon PS: freelancer-portfolio/history: We have just started working with freelancer.com, but have 45 jobs / $7000 on odesk and elance since the beginning of 2009.