I have set of plugins: Gravity Forms, eWay, Sprout Invoices, E-signature.
Need to Create a number of services that customer may purchase and pay for them.
Please do not bit for 10th of hours. It is 2hours max work for an advance level WP developer. Before bidding please read http://docs.sproutapps.co/article/51-advanced-integrations-with-premium-form-plugins-tutorial and at least know that Gravity forms are imported as XML file and you do not need access to the website.