A method of a first network application platform providing a second network application platform access to user data hosted on the first network application platform, the method comprising: at a first network application platform comprising at least one processor and non-transitory memory: receiving a request to allow access to user data hosted on the first network application platform; generating a two-dimensional code to enable access to the user data through the second network application platform; transmitting the two-dimensional code to the second network application platform; receiving information associated with the two-dimensional code; and authoring access to the user data through the second network application platform based at least on the received information associated with the two-dimensional code; wherein receiving information associated with the two-dimensional code comprises: receiving the information of the two-dimensional code scanned by a client device; obtaining an identifier of the client device scanning the two-dimensional code; searching for user information based at least on the identifier; establishing and storing a corresponding relationship between the second network application platform and the user information; sending authorization determination information to the client device directing the client device to determine whether to perform authorization; receiving an authorization confirmation instruction from the client device; and sending authorization confirmation information to the second network application platform. at a first network application platform comprising at least one processor and non-transitory memory: receiving a request to allow access to user data hosted on the first network application platform; generating a two-dimensional code to enable access to the user data through the second network application platform; transmitting the two-dimensional code to the second network application platform; receiving information associated with the two-dimensional code; and authoring access to the user data through the second network application platform based at least on the received information associated with the two-dimensional code; wherein receiving information associated with the two-dimensional code comprises: receiving the information of the two-dimensional code scanned by a client device; obtaining an identifier of the client device scanning the two-dimensional code; searching for user information based at least on the identifier; establishing and storing a corresponding relationship between the second network application platform and the user information; sending authorization determination information to the client device directing the client device to determine whether to perform authorization; receiving an authorization confirmation instruction from the client device; and sending authorization confirmation information to the second network application platform. receiving a request to allow access to user data hosted on the first network application platform; generating a two-dimensional code to enable access to the user data through the second network application platform; transmitting the two-dimensional code to the second network application platform; receiving information associated with the two-dimensional code; and authoring access to the user data through the second network application platform based at least on the received information associated with the two-dimensional code; receiving the information of the two-dimensional code scanned by a client device; obtaining an identifier of the client device scanning the two-dimensional code; searching for user information based at least on the identifier; establishing and storing a corresponding relationship between the second network application platform and the user information; sending authorization determination information to the client device directing the client device to determine whether to perform authorization; receiving an authorization confirmation instruction from the client device; and sending authorization confirmation information to the second network application platform.