The authorization server generates an access token, which the client can use to access the user’s resources on the resource server.The client uses this authorization code to request the access token from an endpoint provided by the authorization server.Instead, an authorization code is generated and shared with the client. These credentials are not shared with the client. The user grants authorization to the client through the authorization server by logging in with their credentials.The client requests authorization from the user (i.e., the resource owner) to access their resources on the resource server.The client gets a client ID and a client secret from the authorization server, which it uses to identify itself when requesting an access token.Let’s take a look at the step-by-step process involved in implementing the OAuth 2.0 authorization method: First, the client is issued a code on authorization, which is then used to request the access token from an access token URL provided by the authorization server. Authorization server: The authorization server issues access tokens to the client after the resource owner successfully authorizes the request.When the resource owner grants access, the client gets the access token that can be used to request the resources within the granted scope. Client: The client is the third-party application that is requesting authorization from the resource owner.It is responsible for accepting and responding to requests to access protected resources using an access token. Resource server: This is the server that is hosting the protected resources.Resource owner: This is the user who is granting third-party access to their data.The following roles exist within the OAuth 2.0 specification: However, not all providers issue refresh tokens the availability of a refresh token is determined by the API provider. Refresh tokens are used to obtain new access tokens and often have a longer lifespan than access tokens. This format ensures that the token can also contain some encrypted data, which can be securely retrieved before the token expires.īecause access tokens are often short-lived, there needs to be a way to generate a new token when the previous token is no longer valid or has expired. Access tokens can be stored in different formats, the most common being the JWT (JSON Web Tokens) format. These tokens represent specific scopes that have been granted by the user or resource owner and are often short-lived. Related: What is OAuth 2.0? Access and refresh tokensĪn access token is an authorization string that is issued to a third-party application. But first, we’ll review access and refresh tokens-and explain how OAuth 2.0 works. In this post, we’ll show how you can use Postman to access a Google API using OAuth 2.0. Large-scale and enterprise organizations use OAuth 2.0 as a primary method for authorizing access to their users’ data, and it has grown over the years to become an industry standard. It also allows an application to get user-consented access to specific data without requesting any confidential data (such as passwords) from the user. It provides a standardized and secure protocol for authorization between APIs and third-party applications that doesn’t require users to share credentials. OAuth 2.0 plays an important role in API data security. There are many standards that define how it is done, but the Open Authorization 2.0 standard-referred to as OAuth 2.0 for short-is the most popular and widely used. Don’t forget to register here to attend POST/CON 24, Postman’s biggest API conference ever: April 30 to in San Francisco.Īuthorization is a fundamental part of working with an API.
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