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Hi @sqaud4!
I'll include some links where you can read more about the topics you asked about. Since you haven't specified what product you're using I will assume it is Qlik Cloud.
1. It is possible to implement a multi-factor authentication system for both on-premise and cloud, please take a look at this step-by-step guide for how to deploy it on the cloud: https://help.qlik.com/en-US/cloud-services/Subsystems/Hub/Content/Sense_Hub/Introduction/qcs-MFA.htm
2. For more information on Qliks REST-connector you can read here: https://help.qlik.com/en-US/connectors/Subsystems/REST_connector_help/Content/Connectors_REST/REST-c...
3. You can load JSON data by using the aforementioned REST-connector.
Hopefully this gives you some good starting points!