PHP Web Application - Asterisk

Successful Freelancer must be capable of 1. Configuring our Asterisk and the A2Billing in a way for us to start selling VoIP services. 2. Developing a PHP Application to automate the processes for customers to order accounts online, pay online, and receive the details of their account online. Available Server Configuration: Asterisk, FreePBX installed and A2Billing. The service planned to be offered is designed for customers that are in need of a 1. SIP Account & a DID number to only receive calls to be billed at 9,99 € per month, payable for 6 months (5% discount), or 12 months (10% discount) or 24 months (15% discount). 2. SIP Account & DID number to receive incoming calls and initiate outgoing calls priced and billed same as (1) and outgoing calls are billed in accordance with the actual rates table (here customers when ordering this service, they have to make a pre-payment to their account – Only on prepayment basis) 3. SIP Account & DID number to receive incoming calls and initiate outgoing calls to only one (1) destination of choice, billed at a Flat Rate of 49 € per month for unlimited outgoing phone calls to fixed network. It is payable for 1 month or 6 months (5% discount), or 12 months (10% discount) or 24 months (15% discount). 4. DID number for conference services to be billed in a flat rate at 19,99 € per month. It is payable for 1 month or 6 months (5% discount), or 12 months (10% discount) or 24 months (15% discount). So the PHP Web Application must allow the possibility to offer the above services online, to make the payments online, to receive automatically the account information, and to verify and control the payment. Customer must be able to access their accounts online through the web application. Our Administrator must be able to access the ADMIN PANEL to also manually assign accounts for the above 4 different services, manage customers account, debit or credit amounts and all other necessary elements of an Admin Panel.