The Upsert Key checkbox indicates that the field is used as a key for upserting records. The Is Required for Upsert checkbox indicates that the field is mandatory for upserting records. The developer needs to check both checkboxes on the Account Id field to update the Account status only if the Account record already exists. Otherwise, a new account will be created.

In Preview, the JSON node that shows the data sent to the Response Action is the name of the Response Action itself. In this case, it is ResponseCart. The other nodes show either the input data or the output data of the Integration Procedure.

Versioning a FlexCard allows the developer to make changes to the FlexCard without affecting the existing instances of the FlexCard. The developer can choose to update all instances of the FlexCard with the new version or keep them as they are. This is useful when the changes are minor and do not affect the functionality or layout of the FlexCard. Cloning a FlexCard creates a copy of the FlexCard with a new name and ID. The developer can make changes to the cloned FlexCard without affecting the original FlexCard. This is useful when the changes are major and require a different configuration or design of the FlexCard1. In this case, since all instances of the FlexCard must be updated with the changes, versioning is the best course of action.

A Set Values Action in a Value field and a Remote Action in an Additional Output value field can execute a function like CONCAT or DATEDIFF by using the syntax {{function(parameters)}}. For example,
{{CONCAT('Hello', 'World')}} or {{DATEDIFF('2021-01-01', '2021-01-31')}}.

According to the Integration Procedure Actions page, a Calculation Action can be used to "call a Calculation Procedure that performs calculations on input data" and a Matrix Action can be used to "call a Calculation Matrix that performs calculations on input data".