When integrating third-party identity verification services, the most common architectural mistake is leaking provider-specific terminology into your core domain logic. If your application code is littered with terms like per_call_service_result or unified_score_pts, you create a tight coupling that makes future migrations or multi-provider strategies prohibitively expensive.
The Problem: Provider Leakage
Provider-specific naming creates a "leaky abstraction." When your internal business rules depend on the exact naming conventions of a vendor, changing a service—or even adding a second one for redundancy—requires a refactor of your entire downstream logic. Instead, you should define a local naming taxonomy that reflects your business intent, not the vendor's API structure.
Establishing Your Local Taxonomy
To decouple your system, create an adapter layer that maps provider outputs to your internal domain model.
Terms to Own Locally
Focus on the intent of the data. Use these for your internal variables and database schemas:
-
IdentitySignal: A generic wrapper for any registration presence information. -
RiskAssessment: A container for your internal risk scoring and classification. -
VerificationOutcome: The final, human-readable status used by your decision engines.
Terms to Keep Provider-Specific
Keep these strictly within your integration adapter or service-specific modules:
-
ServiceSignal: Specific platform registration data (e.g., WhatsApp presence). -
SystemScore: Raw numerical values (e.g., 0–1000 PTS) provided by a specific scoring engine. -
ClassificationLabel: The raw risk category (e.g., LOW, MEDIUM, HIGH) returned by a specific API.
Conceptual Mapping Example
Instead of passing raw API results through your application, use an adapter to normalize them into your local taxonomy:
// Adapter layer: Normalizes provider output to local taxonomy
function mapToLocalDomain(providerResponse) {
return {
// Local taxonomy: 'identitySignal'
// Provider-specific: 'platform_registration_signal'
identitySignal: providerResponse.platform_registration_signal,
// Local taxonomy: 'riskAssessment'
// Provider-specific: 'pts_score' and 'risk_label'
riskAssessment: {
score: providerResponse.pts_score,
category: providerResponse.risk_label
}
};
}
Review Rule: The "Swap Test"
To ensure your taxonomy is clean, apply the "Swap Test." If you were to replace your current provider with a different service that offers similar capabilities, how many lines of code would you need to change?
If the answer is "only the adapter layer," your taxonomy is successful. If you find yourself updating your database schema or your core decision-making logic, your local naming is likely too closely tied to the provider's implementation details.
Conclusion
By establishing a local naming taxonomy, you transform your integration from a rigid dependency into a flexible service. Treat provider outputs as raw, untrusted data that must be normalized before it enters your application's business logic. This separation ensures that your system remains maintainable, testable, and ready for future architectural changes.
This article was drafted with AI assistance and reviewed before publishing.
