To satisfy the requirements, a developer should implement a flow and an invocable method. A flow is a declarative tool that allows you to automate business processes by collecting data and performing actions in your org or an external system1. An invocable method is a method that can be called by a flow, a process, or another Apex method2. By using a flow and an invocable method, the developer can achieve the following steps:
* Create a flow that guides the sales rep through the scripted steps with each new customer they create1.
* In the flow, use an Apex action to invoke an invocable method that calls the REST endpoint of UC's ERP system and passes the customer information as a parameter23.
* In the invocable method, use the HttpRequest and HttpResponse classes to send a GET request to the REST endpoint and receive a response that contains the customer data4.
* In the invocable method, parse the response body and return the customer data as an output parameter to the flow24.
* In the flow, use a screen element to display the customer data to the sales rep if the customer exists in the ERP system1.
Using a future method or a trigger are not effective ways to satisfy the requirements. A future method is a method that runs in the background, asynchronously, after the current transaction finishes5. A trigger is a piece of Apex code that executes before or after a record is inserted, updated, deleted, or undeleted. Neither of these options can interact with the flow or the sales rep, and they are not suitable for calling a REST endpoint that requires a synchronous response5 . References: 1 Automate Your Business Processes with Flows | Salesforce Trailhead1, 2 InvocableMethod Annotation | Apex Developer Guide | Salesforce Developers2, 3 Call Apex Code from a Flow | Salesforce Trailhead3, 4 Apex REST Callouts | Apex Developer Guide | Salesforce Developers4, 5 Asynchronous Apex | Apex Developer Guide | Salesforce Developers5, Triggers | Apex Developer Guide | Salesforce Developers