add bitcoin shop config and payment method enablement

backend/src/utils/payment/isPaymentMethodEnabled.ts

@@ -0,0 +1,6 @@
+import type { PaymentMethod } from '../../modules/payment/types/PaymentMethod';
+
+export const isPaymentMethodEnabled = (
+    method: PaymentMethod,
+    enabledMethods: readonly PaymentMethod[]
+): boolean => enabledMethods.includes(method);

backend/src/utils/payment/isPaymentMethodValue.ts

@@ -0,0 +1,5 @@
+import { PaymentMethod } from '../../modules/payment/types/PaymentMethod';
+
+const PAYMENT_METHOD_VALUES = new Set<string>(Object.values(PaymentMethod));
+
+export const isPaymentMethodValue = (value: string): value is PaymentMethod => PAYMENT_METHOD_VALUES.has(value);

backend/src/utils/payment/parseEnabledPaymentMethods.spec.ts

@@ -0,0 +1,25 @@
+import { PaymentMethod } from '../../modules/payment/types/PaymentMethod';
+import { parseEnabledPaymentMethods } from './parseEnabledPaymentMethods';
+
+describe('parseEnabledPaymentMethods', () => {
+    it('parses a single enabled method', () => {
+        expect(parseEnabledPaymentMethods('xmr')).toEqual([PaymentMethod.Xmr]);
+    });
+
+    it('parses multiple enabled methods', () => {
+        expect(parseEnabledPaymentMethods('xmr, btc')).toEqual([PaymentMethod.Xmr, PaymentMethod.Btc]);
+    });
+
+    it('returns an empty array for empty input', () => {
+        expect(parseEnabledPaymentMethods('')).toEqual([]);
+    });
+
+    it('filters out unsupported methods', () => {
+        expect(parseEnabledPaymentMethods('eth')).toEqual([]);
+        expect(parseEnabledPaymentMethods('xmr,eth')).toEqual([PaymentMethod.Xmr]);
+    });
+
+    it('filters out duplicate methods', () => {
+        expect(parseEnabledPaymentMethods('xmr,xmr')).toEqual([PaymentMethod.Xmr]);
+    });
+});

backend/src/utils/payment/parseEnabledPaymentMethods.ts

@@ -0,0 +1,12 @@
+import type { PaymentMethod } from '../../modules/payment/types/PaymentMethod';
+import { isPaymentMethodValue } from './isPaymentMethodValue';
+
+export const parseEnabledPaymentMethods = (raw: string): PaymentMethod[] => {
+    const methods = raw
+        .split(',')
+        .map(value => value.trim())
+        .filter(Boolean)
+        .filter(isPaymentMethodValue);
+
+    return [...new Set(methods)];
+};