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Handle verification process error in the Verification Webservice API in case there is a connection issue to the Webservice or if it responds with an error. This solution ensures that the agent can see an error message when the credit verification process failed, and take appropriate actions. The Verification Webservice API can implement error handling logic to catch any exceptions or errors that occur during the callout to the external agencies, and return a meaningful error message to the agent. The agent can then retry the verification process, or escalate the issue to a supervisor. References: Certification - Integration Architect - Trailhead, [Apex Web Services and Callouts]

An API gateway is a component that acts as a single point of entry for all cloud applications to access on-premise resources and services. It can provide security, routing, transformation, and other features to facilitate integration. An API gateway component should be deployable behind a DMZ or perimeter network, which is a subnetwork that separates the internal network from the external network and provides an additional layer of security. The middleware solution should also be capable of establishing a secure API gateway between cloud applications and on-premise resources, which may involve using protocols such as HTTPS, SSL/TLS, or VPN. The OAuth security protocol is not a requirement for choosing a middleware solution, as it is a standard for authorizing access to resources on behalf of a user. The middleware solution’s ability to interface directly with databases via an ODBC connection string is also not a requirement, as it is a specific feature that may or may not be needed depending on the integration scenario. Reference: Salesforce Integration Architecture Designer Resource Guide, page 14-15

The mobile device should make a REST Apex inbound call to meet the requirement. A REST Apex inbound call allows the mobile device to invoke custom Apex logic on Salesforce using a RESTful interface. The Apex logic can then access the geolocation field using the user’s OAuth token and update it with the GPS coordinates from the mobile device. The geolocation field is secured with Field Level Security, so the user can view the value without changing it. A SOAP API inbound call or a REST API inbound call would not be able to access the custom geolocation field, as they are not supported by the standard Salesforce objects and fields. Reference: Salesforce Integration Architecture Designer Resource Guide, page 20

 Invoking middleware service to retrieve valid shipping methods is a solution that can allow the sales representatives to select between valid services for the customer’s country. The middleware service can act as a single point of entry for all shipping services and provide routing and transformation capabilities. Using middleware to abstract the call to the specific shipping services is a solution that can allow the sales representatives to request shipping estimates from the selected service. The middleware can hide the complexity and heterogeneity of the shipping services and provide mediation and orchestration capabilities. Using Platform Events to construct and publish shipper-specific events is not a solution, as Platform Events are used for event-driven integration, not for web-service integration. Storing shipping services in a picklist that is dependent on a country picklist is not a solution, as it does not address how to request shipping estimates from the shipping services. Reference: Salesforce Integration Architecture Designer Resource Guide, page 16-17

 The BatchApexErrorEvent object allows handling errors that occur during Batch Apex execution. By subscribing to this event, the integration can retry the invoice generation for the failed records or perform other recovery actions. This is a resilient and scalable solution that does not require custom code in the Batch Apex job itself or in the middleware1