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Voucher basic working
running tables shifted to cards from buttons, this gives us immense styling oportunities

bookie/src/app/sales/bills/voucher.service.ts

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+import { Injectable } from '@angular/core';
+import { Observable } from 'rxjs/internal/Observable';
+import { catchError } from 'rxjs/operators';
+import { HttpClient, HttpHeaders, HttpParams } from '@angular/common/http';
+import { ErrorLoggerService } from '../../core/error-logger.service';
+import {Bill} from "./bill";
+
+const httpOptions = {
+  headers: new HttpHeaders({'Content-Type': 'application/json'})
+};
+
+const url = '/v1/vouchers';
+const serviceName = 'VoucherService';
+
+@Injectable({providedIn: 'root'})
+export class VoucherService {
+
+  constructor(private http: HttpClient, private log: ErrorLoggerService) {
+  }
+
+  get(id: string): Observable<Bill> {
+    return <Observable<Bill>>this.http.get<Bill>(`${url}/${id}`)
+      .pipe(
+        catchError(this.log.handleError(serviceName, `get id=${id}`))
+      );
+  }
+
+  getFromTable(tableId: string, voucherId: string, guestId: string): Observable<Bill> {
+    let params = new HttpParams();
+    if (tableId !== null) {
+      params = params.set('t', tableId);
+    }
+    if (voucherId !== null) {
+      params = params.set('v', voucherId);
+    }
+    if (guestId !== null) {
+      params = params.set('g', guestId);
+    }
+
+    return <Observable<Bill>>this.http.get<Bill>(`${url}/new`, {params: params})
+      .pipe(
+        catchError(this.log.handleError(
+          serviceName,
+          `getFromTable tableId=${tableId} voucherId=${voucherId} guestId=${guestId}`
+        ))
+      );
+  }
+
+  save(voucher: Bill): Observable<Bill> {
+    return <Observable<Bill>>this.http.post<Bill>(`${url}/new`, voucher, httpOptions)
+      .pipe(
+        catchError(this.log.handleError(serviceName, 'save'))
+      );
+  }
+
+  update(voucher: Bill): Observable<Bill> {
+    return <Observable<Bill>>this.http.put<Bill>(`${url}/${voucher.id}`, voucher, httpOptions)
+      .pipe(
+        catchError(this.log.handleError(serviceName, 'update'))
+      );
+  }
+
+  saveOrUpdate(voucher: Bill): Observable<Bill> {
+    if (!voucher.id) {
+      return this.save(voucher);
+    } else {
+      return this.update(voucher);
+    }
+  }
+}