Verifies the specified user attributes in the user pool.
See https://www.paws-r-sdk.com/docs/cognitoidentityprovider_verify_user_attribute/ for full documentation.
cognitoidentityprovider_verify_user_attribute(AccessToken, AttributeName, Code)
[required] A valid access token that Amazon Cognito issued to the user whose user attributes you want to verify.
[required] The attribute name in the request to verify user attributes.
[required] The verification code in the request to verify user attributes.