I have realised I need to give a better brief, so that everyone can understand what I am trying to replicate.

I want to develop a chrome extension that allows integration between LinkedIn and Zoho CRM. I want people to be able to sign up for the extension, and pay for it monthly. This extension must be able to create an API from Zoho CRM that, once the same user is logged into Linkedin, is able to check the zoho database, against the company or contact you are currently viewing on LinkedIn, and see if it is in your Zoho database.

If the company/contact is not in the database, there is a red x, indicating that we have to add this contact. If you click on the red cross, all the fields from LinkedIn are then visible to add into Zoho, and you can adjust and change the details as the user needs to (if they think the title is different or something, they can personalise the update) and then you create the contact, and this contact will then be created in Zoho.

If the contact/company is already in the Zoho Database, it will have a green tick, and you can then choose to look at what updates are available against your already captured data (perhaps the cellphone number has changed, or they have moved companies - etc etc) - you can then choose the fields you want to update, and it will then push down to the  zoho db with the updates. 

I would like an exact copy of this software: https://linkmatch.net/ including the ability to bill my clients monthly on it.

PLEASE WATCH THIS VIDEO TO SEE THE FUNCTIONALITY:
https://www.youtube.com/watch?v=dabiwX2OfCY&index=1&list=PLP4-eFeS8mPsF1evmHP3VtFj1rgJlXYio

Please let me know A) if you can do this, including the payment option and B) how long it will take