Abstract: A client system comprises processing circuitry configured to receive, from a user device, a first access request comprising a first instruction to access a protected resource; transmit a token request for an access token to be used for accessing the protected resource; and receive an access token in response to the token request, the access token having a corresponding time to expire. The client system comprises a token storage unit configured to store the access token. The processing circuitry is further configured to receive a rejection message indicating that the access token is not valid for receiving the protected resource; and store, at the token storage unit, an invalidation flag associated with the stored access token, in response to receiving the rejection message.

Abstract: A client system comprises processing circuitry configured to receive, from a user device, a first access request comprising a first instruction to access a protected resource; transmit a token request for an access token to be used for accessing the protected resource; and receive an access token in response to the token request, the access token having a corresponding time to expire. The client system comprises a token storage unit configured to store the access token. The processing circuitry is further configured to receive a rejection message indicating that the access token is not valid for receiving the protected resource; and store, at the token storage unit, an invalidation flag associated with the stored access token, in response to receiving the rejection message.

Abstract: A client system obtains an access token for accessing a protected resource stored at a resource system. A storage resource of the system stores a plurality of grant method code portions, a plurality of authentication method code portions and a configurable database. The client system comprises processing circuitry configured to receive an access request from a user device. The access request comprises an instruction for the client system to access a protected resource and a request identifier indicative of an authorization system for authorizing access to the protected resource. The client system uses the configurable database and code portions to execute the grant and authentication methods supported by the authorization system. The client system receives the access token from the authorization sever, in response to executing the grant and authentication methods.

Abstract: A client system comprises processing circuitry configured to receive, from an authorisation system, a first grant token for identifying the client system at the authorisation system, the first grant token having a corresponding time to expire indicative of a time at which the first grant token will not be valid for obtaining a protected resource from a resource system. The client system transmits, to the authorisation system, a refresh request for a second grant token for identifying the client system at the authorisation system, wherein the refresh request is transmitted based on the expiry time of the first grant token; and receives the second grant token at the client system, in response to the refresh request.

Abstract: A client system comprises processing circuitry configured to receive, from an authorisation system, a first grant token for identifying the client system at the authorisation system, the first grant token having a corresponding time to expire indicative of a time at which the first grant token will not be valid for obtaining a protected resource from a resource system. The client system transmits, to the authorisation system, a refresh request for a second grant token for identifying the client system at the authorisation system, wherein the refresh request is transmitted based on the expiry time of the first grant token; and receives the second grant token at the client system, in response to the refresh request.

Abstract: A client system comprises processing circuitry configured to receive, from a user device, a first access request comprising a first instruction to access a protected resource; transmit a token request for an access token to be used for accessing the protected resource; receive an access token in response to the token request, the access token having a corresponding time to expire indicative of a time at which the access token will not be valid for obtaining the protected resource; and transmit the access token to a resource system and, in response, receive the protected resource. The client system further comprises a token storage unit configured to store the access token.

Abstract: A client system obtains an access token for accessing a protected resource stored at a resource system. A storage resource of the system stores a plurality of grant method code portions, a plurality of authentication method code portions and a configurable database. The client system comprises processing circuitry configured to receive an access request from a user device. The access request comprises an instruction for the client system to access a protected resource and a request identifier indicative of an authorization system for authorizing access to the protected resource. The client system uses the configurable database and code portions to execute the grant and authentication methods supported by the authorization system. The client system receives the access token from the authorization sever, in response to executing the grant and authentication methods.

Abstract: A client system comprises processing circuitry configured to receive, from a user device, a first access request comprising a first instruction to access a protected resource; transmit a token request for an access token to be used for accessing the protected resource; and receive an access token in response to the token request, the access token having a corresponding time to expire. The client system comprises a token storage unit configured to store the access token. The processing circuitry is further configured to receive a rejection message indicating that the access token is not valid for receiving the protected resource; and store, at the token storage unit, an invalidation flag associated with the stored access token, in response to receiving the rejection message.