What is the purpose of grant_type parameter in OAuth 2 Authentication

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I am using OAuth 2 Authentication in Lumen microframework. Right now i am using the grant_type value is password. It throws unsupported_grant_type, If i am using something different. I want to know the purpose of using grant_type is password

2 Answers

in OAuth 2.0, the term “grant type” refers to the way an application gets an access token. OAuth 2.0 defines several grant types, including the authorization code flow. OAuth 2.0 extensions can also define new grant types.

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