How can i integrate my API with ZOHO? Help.

How can i integrate my API with ZOHO? Help.

What we want to achieve is that when a user from the ZoHo CRM interface opens a new Company Record and starts typing in the company name field for example... "Mobile" The all companies will be visible in a menu that starts with the word "Mobile" (Retrieved from an external API). The user can then select the right company and the automatically all data should be pulled up from that database and filled into the right field in the ZoHo CRM record. This data will be for example, address, registration number, phone number, etc.
Anyone?