make account service with grn

Frontend/erp-system/lib/api/grns.ts

@@ -10,8 +10,10 @@ import { apiRequest, buildQuery } from "@/lib/api-client"
 import { PagedResponse } from "@/types/common"
 import {
   ConfirmGrnResponse,
+  CreateGrnPaymentRequest,
   CreateGrnRequest,
   Grn,
+  GrnPayment,
   GrnStatus,
   GrnSummary,
   ReleaseAction,
@@ -58,4 +60,14 @@ export const grnsApi = {
       body: { action },
     })
   },
+
+  /** Pay the vendor against the GRN's balance, in full or in installments. Posts a real GL journal entry. */
+  pay(grnId: number, request: CreateGrnPaymentRequest): Promise<GrnPayment> {
+    return apiRequest<GrnPayment>(`/grns/${grnId}/payments`, { method: "POST", body: request })
+  },
+
+  /** Payment history for a GRN, newest first. */
+  listPayments(grnId: number): Promise<GrnPayment[]> {
+    return apiRequest<GrnPayment[]>(`/grns/${grnId}/payments`)
+  },
 }