create new gravity-forms add-on (1)

I need some new functions to extend the paypal-add-on for the Gravity-Forms Plugin. I need the same quality as the already existing add-ons, e.g. the paypal-plugin or the register plugin. What are the required functions of this extension : I need a switch at the backend so i could choose if credit-card payment via paypal is enabled or not. If this is enabled the user will be redirected to the right paypal-form, so also a non-paypal-user could pay by credit-card. I also need a swicth 'credit-card pre-processing'. If this is enabled at the attached gravity-form the fields to catch the credit-card data will be displayed. If the user fill this fields a check must be processed, to check the credit-card-data. After this there will be no paypal redirection. The form-data will be saved. At the 'entries' section there are currently three functions for each entry. "View | Mark Read | Delete". This should be extended by "Pay now". This link should only appear if the entry isn't payed yet. If the admin use this link he will be redirected to the paypal-credit-card form and the values from the entry will be populated at the paypal-form. Why i need this. ? We will sell some events and will only collects the money, if the event happens. If we don't get the right number of persons, the event will not happen. The first part (paypal-credit-card payment) must be populated the the programmer of the original paypal-add-on. I will ask the programmer. The second part could also a seperate add-on that will call the paypal-add-on. Please see my other gravity-forms related projects. I only upload escrow payments and will release the money not before the project is fully finished. If you can't finish the project as required or you can't finish in time, you have to cancel the escrows and there will be no payment. With your bid you agree to this.