Using Twilio for my Pay Per Call Sites

Avg Bid (USD)
Project Budget (USD)
$250 - $750

Project Description:
I need a I am starting a LockSmith website, i will add clients all over the USA so i will have a lot of forwarding numbers provided by Twilio, i will advertise their service on my sites, i will need a back-end set up so my clients can log in and see there calls, and i will also need to set a price per call, each client will pay a different amount per call, then it will need to automatically send a invoice twice a month.
if you have any questions please let me know,
also please reply with the detail of what you will need the site is already being built, so you will need to build the log in, i guess one admin page so i can add clients and add their number, and set up there price.

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