Uniersal Containers (UC) is developing a process for their sales teams that requires all sales reps to go through a set of scripted steps with each new customer they create. In the first steps of…

While a Flow would orchestrate the scripted steps and call the Apex, the question asks what a *developer* should implement, pointing to the code components rather than the declarative orchestration tool itself.

A Future method is suitable for making asynchronous callouts to external ERP systems via a REST endpoint, as callouts often need to run in the background to avoid governor limits or block UI.

A Trigger executes automatically on record DML and is not designed for an interactive, guided screen flow that involves user input and immediate presentation of external data.

An Invocable method allows for custom Apex logic, including initiating a future method or directly performing a callout, to be executed from a Flow and return data for presentation within the sales rep's scripted steps.