Connect Interpire email marketer to opengateway billing

HI! I need an Interspire expert who can integrate it with a billing system. We want a PHP and API expert that can integrate [login to view URL] with Interspire email marketer. My needs are: 1)Connect our simple sign up form to my Interspire email marketer via the email marketer API and the opengateway billing system API. We need you to connect our subscription form to both systems. You will have to create a new user with the right permission base on the plan on both systems. We will also need to be able to apply a coupon (The coupon info will be available via the billing system API) 2) Once a user is connected to Email marketer a check should be made to see if the customer plan is paid and up to date. If the plan is not up to date we will display a warning message and bloc access to some features. 3) Add a new tab into Interspire (billing and plan) • Get the list of invoices (You will have to use the API of the billing system to get information) • Show the current plan and upgrade option(You will have to use the API of the billing system to get information) • Change payment method (You will have to transfer the changes to the Billing system via the API) 4) Paid for non-recurrent plan within Interspire Email Marketer 5) Add a tab into the EDIT A USER section of the email marketer that will allow the user to Change its personal information (You should transfer the update to the Billing system via the API) 6) And before doing some specific task, I need to check if the customer plan is up to date otherwise we should denied the access to the task he wants to do. If the customer plan is not paid: • He should not be able to Add New Contact • Import Contact • Create Contact group • Modify existing contacts and groups • Create new email • Send email • Auto responded or scheduled job should not work • Create email campaign • Create survey • All existing survey should not work All those accesses denied will be the same function and it will also be the same message that will appears. So that may look like there is a lot of job but 90% of the task is repetitive. Note* The billing system API give full access to the system and I Also get a lot of example of how do most of the tasks you have to do. I will be able to assist with your task. And I know exactly what I want. I’m not a PHP expert, but I can help. This project required a PHP expert and a good knowledge of API. You should already know Interspire Email marketer. You will have to make a deep integration of the billing system and the email system. Please DO NOT BID IF YOU ARE NOT SERIOUS AND NOVICE! You will have to sign a confidential contract before I give any access to our infractructures. And also You will not allowed to reselle our code to your customers. I will send more details later and provide you access to the billing and the email system for you to evaluate the job. Thank you! And happy New Year!