feat: ( payment ) integrate the passenger to payment microservice

apps/edr-passenger-api/src/modules/payments/payment-client.service.ts

@@ -0,0 +1,92 @@
+import { BadGatewayException, Injectable, Logger } from "@nestjs/common";
+import { HttpService } from "@nestjs/axios";
+import { AxiosError } from "axios";
+import { firstValueFrom } from "rxjs";
+import {
+  InitiatePaymentRequest,
+  PaymentIntentSnapshot,
+  PaymentReferenceType,
+  PaymentService,
+} from "@edr/types";
+
+/**
+ * Thin HTTP client for the payment microservice (apps/edr-payment-api) — the passenger app's
+ * side of the Phase 6 cutover (docs/payment-service §10). Domain validation stays here;
+ * provider calls, intents, and webhooks live in the payment service.
+ */
+@Injectable()
+export class PaymentClientService {
+  private readonly logger = new Logger(PaymentClientService.name);
+  private readonly baseUrl = (
+    process.env.PAYMENT_API_URL ?? "http://localhost:3003"
+  ).replace(/\/$/, "");
+  private readonly serviceToken = process.env.SERVICE_AUTH_TOKEN ?? "";
+
+  constructor(private readonly http: HttpService) {}
+
+  /** POST /payments/initiate — idempotent per (service, referenceType, referenceId). */
+  async initiate(
+    request: InitiatePaymentRequest,
+  ): Promise<PaymentIntentSnapshot> {
+    return this.call("POST", "/payments/initiate", request);
+  }
+
+  /** GET /payments/intents?… — active intent by domain reference; null when none exists. */
+  async getIntentByReference(
+    referenceType: PaymentReferenceType,
+    referenceId: string,
+  ): Promise<PaymentIntentSnapshot | null> {
+    const query = new URLSearchParams({
+      service: PaymentService.PASSENGER,
+      referenceType,
+      referenceId,
+    });
+    try {
+      return await this.call("GET", `/payments/intents?${query.toString()}`);
+    } catch (err) {
+      if (err instanceof AxiosError && err.response?.status === 404)
+        return null;
+      throw err;
+    }
+  }
+
+  private async call<T>(
+    method: "GET" | "POST",
+    path: string,
+    body?: unknown,
+  ): Promise<T> {
+    const url = `${this.baseUrl}${path}`;
+    try {
+      const response = await firstValueFrom(
+        this.http.request<T>({
+          method,
+          url,
+          data: body,
+          headers: this.serviceToken
+            ? { "x-service-token": this.serviceToken }
+            : {},
+        }),
+      );
+      return response.data;
+    } catch (err) {
+      if (err instanceof AxiosError && err.response) {
+        // 4xx/5xx from the payment service: propagate 404 to callers that handle it;
+        // everything else is a gateway-level failure from the client's perspective.
+        if (err.response.status === 404) throw err;
+        const detail =
+          (err.response.data as { message?: string | string[] })?.message ??
+          err.message;
+        this.logger.error(
+          `payment service ${method} ${path} → ${err.response.status}: ${detail}`,
+        );
+        throw new BadGatewayException(`Payment service error: ${detail}`);
+      }
+      const message =
+        err instanceof Error && err.message ? err.message : String(err);
+      this.logger.error(
+        `payment service unreachable (${method} ${path}): ${message}`,
+      );
+      throw new BadGatewayException("Payment service unreachable");
+    }
+  }
+}