add resolveAtomicToCryptoConverter for payment method amount formatting.

backend/src/utils/payment/resolveAtomicToCryptoConverter.ts

@@ -0,0 +1,16 @@
+import { InternalServerErrorException } from '@nestjs/common';
+import { PaymentMethod } from '../../modules/payment/types/PaymentMethod';
+import type { CryptoAtomicConverter } from '../../types/CryptoAtomicConverter';
+import { convertBtcAtomicToBtc } from '../bitcoin/convertBtcAtomicToBtc';
+import { convertXmrAtomicToXmr } from '../monero/convertXmrAtomicToXmr';
+
+export const resolveAtomicToCryptoConverter = (paymentMethod: PaymentMethod): CryptoAtomicConverter => {
+    switch (paymentMethod) {
+        case PaymentMethod.Xmr:
+            return convertXmrAtomicToXmr;
+        case PaymentMethod.Btc:
+            return convertBtcAtomicToBtc;
+        default:
+            throw new InternalServerErrorException(`Unsupported payment method: ${String(paymentMethod)}`);
+    }
+};