Proxy.ts

interface IPaymentAPI {
	getPaymenyDetail(id: number): IPaymentDetail | undefined;
}

interface IPaymentDetail {
	id: number;
	sum: number;
}

class PaymentAPI implements  IPaymentAPI {
	private data = [{id: 1, sum: 1000 }]
	getPaymenyDetail(id: number): IPaymentDetail | undefined {
		return this.data.find(d => d.id === id)
	}
}

class PaymentAccessProxy implements IPaymentAPI {
	constructor(private api: PaymentAPI, private userId: number) {}

	getPaymenyDetail(id: number): IPaymentDetail | undefined{
		if (this.userId === 1) {
			return this.api.getPaymenyDetail(id)
		}
		console.log('Попытка получить данные платежа')
		return undefined
	}
}

const proxy = new PaymentAccessProxy(new PaymentAPI(), 1)
console.log(proxy.getPaymenyDetail(1))

const proxy2 = new PaymentAccessProxy(new PaymentAPI(), 2)
console.log(proxy.getPaymenyDetail(2))