Stop using giant switch statements. Learn how the Factory Method turns rigid systems into flexible plugin architectures.
Published: January 2026 Reading time: 45 minutes Keywords: #factory-method #design-patterns #extensibility #plugin-architecture #clean-code #solid #stripe #wordpress
You’ve built a successful MVP with one payment method. Now the business wants to add PayPal, Apple Pay, and Bitcoin. In a naive architecture, every new method requires modifying your core PaymentProcessor. This is the Scalability Wall.
The Factory Method Pattern is the "Get Out of Jail Free" card for extensibility. It allows a class to defer instantiation to subclasses. It turns your core logic into a "Plugin Host" that doesn't care which specific payment method is being used, only that it follows a specific contract.
Imagine your process() function looks like this:
// ❌ The Violation of Open/Closed Principle
class PaymentProcessor {
async charge(method: string, amount: number) {
if (method === 'stripe') {
return new StripeHandler().charge(amount);
} else if (method === 'paypal') {
return new PayPalHandler().authorize(amount);
}
}
}
interface PaymentMethod {
process(amount: number): Promise<void>;
}
abstract class PaymentStore {
abstract createPaymentMethod(): PaymentMethod;
async checkout(amount: number) {
const method = this.createPaymentMethod();
await method.process(amount);
}
}
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