Guys, I need advice !!!

I am trying to get a job as junior Front-End. They were given the task to impose, to pass on the form of registration of a corporate client. I did almost everything, but here’s one of the points for me as a “young” developer is a completely dark forest.

Namely, the field "Company Name" - validation for the presence of a registered company in the linkedin network; Options are loaded as you type and displayed in the list.

I do not ask for any ready-made solutions, I ask you to tell me at least in which direction to look. All requests in Google (including in English) offer maximum validation with regular expressions. But nothing, not words about validation with pulling up data from the database of companies on the linkedin network.

Tell me where to look for at least something like that. Thank you in advance.

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