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POST
Check companies exist

Authorizations

Authorization
string
header
required

Bearer authentication header of the form Bearer <token>, where <token> is your auth token.

Body

application/json

Full shape is under Schema; example is minimal.

companyNumbers
string[]
required

JSON body for POST companies check.

Response

200 - application/json

Per-number existence flags from the product API.

CompanyNumber
string

Companies House company number as requested.

InDatabase
boolean

True if the company is known to the product API.

Last modified on August 20, 2026