Project: External API Integration Component

A shipmentTracker component looking up a shipment's status from an external carrier API, reusing Module 17's exact architecture: Named Credential → Service → Controller → component, with full error/timeout handling.

public inherited sharing class ShipmentTrackingService {
    public static ShipmentStatus track(String trackingNumber) {
        HttpRequest request = new HttpRequest();
        request.setEndpoint('callout:Carrier_API/track/' + EncodingUtil.urlEncode(trackingNumber, 'UTF-8'));
        request.setMethod('GET');

        HttpResponse response;
        try {
            response = new Http().send(request);
        } catch (CalloutException e) {
            throw new AuraHandledException('Could not reach the carrier service. Please try again.');
        }

        if (response.getStatusCode() != 200) {
            throw new AuraHandledException('Tracking number not found.');
        }

        CarrierResponse raw = (CarrierResponse) JSON.deserialize(response.getBody(), CarrierResponse.class);
        return new ShipmentStatus(raw.status, raw.estimatedDelivery);
    }
}

public with sharing class ShipmentTrackingController {
    @AuraEnabled
    public static ShipmentStatus track(String trackingNumber) {
        return ShipmentTrackingService.track(trackingNumber);
    }
}

Every piece — the Named Credential reference, CalloutException/status-code handling, the wrapper class — is the identical pattern from Module 17's currency converter, applied to a completely different external system.

async handleTrack() {
    this.isTracking = true;
    try {
        this.shipmentStatus = await track({ trackingNumber: this.trackingNumber });
    } catch (error) {
        this.dispatchEvent(new ShowToastEvent({
            title: 'Tracking Failed',
            message: error.body?.message ?? 'An unexpected error occurred.',
            variant: 'error',
        }));
    } finally {
        this.isTracking = false;
    }
}

Called imperatively — triggered by a specific "Track" button click, not something that should load automatically — exactly Module 7's decision table applied once more.