Intergrate ZipPay payment gateway into an existing php based ecommerce site.

We have an online business using squirrelcart as our ecommerce solution. We need to integrate ZipPay into the payment gateway. Looking for some one that has integrated ZipPay previously and bonus points if they have experience with squirrel cart. Our store page is [login to view URL] I have been asked for access to our store control panel a lot. our store is COTS the demo store at this link can give you temp access to test and look how we are set up. [login to view URL] We are happy with our current ecommerce solution and only want a new payment gateway built Here is what Zip Pay have provided in the way of integration [login to view URL] [login to view URL] [login to view URL] Please advise in bid responses if you have experience with: 1. Zip Pay 2 Squirrel Cart 3 php ecommerce platforms 4 payment gateways A High level understanding Below are some high level concepts involved in a Zip Online API transaction. Though there is more detail is provided in the coming sections, it is key to understand the below before proceeding: •All Zip transactions require at least 2 API calls. A call to our /checkouts endpoint to initiate the customer flow, then a call to our /charges endpoint to 'capture' the funds. •Before the /charges API call can be made, the customer must complete their Zip login or Application (by following the url returned from the /checkouts call) •Only if a customers checkout is Approved, should the /charges call be made, otherwise alternative messaging and handling will come into play BPI Requirements Zip available at checkout Zip widget (and associated ‘More info' popup) to product pages Zip widget (and associated ‘More info' popup) to cart page widget code is here [login to view URL]