MOSTRAR PAYPAL NO CHECKOUT DO APP IONIC

Olá galera, Boa tarde!

Estou com um probleminha em Ionic que está quebrando muito minha cabeça por dias.

Método de pagamento do paypal aparece em meu site, mas não aparece no app ionic, o que será? Já tentei de tudo. Esse app faz comunicação via API do Woocommerce, e lá está habilitado a forma de pagamento com PayPal, porém só não aparece no app, já que na página de checkout no meu site, aparece.

Segue o código da página de checkout do app:

import { Component, Inject } from '@angular/core';
import { NavController, NavParams, AlertController, Loading, LoadingController, ToastController, App } from 'ionic-angular';
import { PlacedPage } from '../placed/placed';
import { PaymentGateway } from "../../models/payment-gateway.models";
import { Constants } from "../../models/constants.models";

import { WordpressClient } from '../../providers/wordpress-client.service';
import { Global } from '../../providers/global';
import { Subscription } from "rxjs/Subscription";
import { CartItem } from "../../models/cart-item.models";
import { OrderRequest } from "../../models/order-request.models";
import { Address } from "../../models/address.models";
import { ShippingLine } from "../../models/shipping-line.models";
import { UserResponse } from "../../models/user-response.models";
import { OrderResponse } from "../../models/order-response.models";
import { Currency } from "../../models/currency.models";
import { InAppBrowser, InAppBrowserOptions } from '@ionic-native/in-app-browser';
import { sha512 } from 'js-sha512';
import { APP_CONFIG, AppConfig } from '../../app/app.config';
import { OrderUpdateRequest } from '../../models/order-update-request.models';
import { Coupon } from '../../models/coupon.models';
import { HomePage } from '../home/home';
import { TranslateService } from '@ngx-translate/core';
import { Helper } from '../../models/helper.models';
import { ShippingMethod } from '../../models/shipping-method.models';
import { PayPal, PayPalPayment, PayPalConfiguration, PayPalPaymentDetails } from '@ionic-native/paypal';

@Component({
selector: 'page-payment',
templateUrl: 'payment.html',
providers: [WordpressClient]
})

export class PaymentPage {

	private loading: Loading;
	private loadingShown: Boolean = false;
	private placedPagePushed: Boolean = false;
	private paymentDone: Boolean = false;
	private paymentFailAlerted: Boolean = false;

	private subscriptions: Array<Subscription> = [];
	private paymentGateways = new Array<PaymentGateway>();
	private cartItems: Array<CartItem>;
	private selectedPaymentGateway;
	private selectedAddress: Address;
	private orderRequest: OrderRequest;
	private orderId = -1;
	private user: UserResponse;
	private totalItems = 0;
	private total = 0;
	private couponApplied = false;
	private pickupTime = 0;
	private deliveryTime = 0;
	private shippingChargeGlobal: number;

	constructor(@Inject(APP_CONFIG) private config: AppConfig, public translate: TranslateService, private iab: InAppBrowser, private toastCtrl: ToastController, public navCtrl: NavController, private navParams: NavParams, private service: WordpressClient, private loadingCtrl: LoadingController, private alertCtrl: AlertController, public appCtrl: App) {
 this.cartItems = this.navParams.get('cart');
 this.totalItems = this.navParams.get('totalItems');
 this.total = this.navParams.get('total');
 this.shippingChargeGlobal = this.navParams.get('shippingChargeGlobal');

 let paymentGateways = JSON.parse(window.localStorage.getItem(Constants.PAYMENT_GATEWAYS));
 this.selectedAddress = JSON.parse(window.localStorage.getItem(Constants.SELECTED_ADDRESS));

 if (paymentGateways != null) {
 for (let pg of paymentGateways) {
 if (pg.enabled && this.paymentImplemented(pg.id)) {
 this.paymentGateways.push(pg);
 }
 }
 }
	}

	ionViewWillLeave() {
 this.subscriptions.forEach((subscription: Subscription) => {
 subscription.unsubscribe();
 });
 this.dismissLoading();
	}

	paymentImplemented(id) {
 return id === "pumcp" || id === "payuindia" || id === "cod";
	}

	paymentMethod(paymentGateway) {
 this.selectedPaymentGateway = paymentGateway;
	}

	placedPage() {
 if (this.selectedPaymentGateway == null) {
 this.translate.get('field_error_payment_method').subscribe(value => {
 this.showToast(value);
 });
 } else {
 this.orderRequest = new OrderRequest();
 this.orderRequest.payment_method = this.selectedPaymentGateway.id ? this.selectedPaymentGateway.id : "cod";
 this.orderRequest.payment_method_title = this.selectedPaymentGateway.title ? this.selectedPaymentGateway.title : "cod";
 this.orderRequest.set_paid = false;
 this.orderRequest.billing = this.selectedAddress;
 this.orderRequest.shipping = this.selectedAddress;
 this.user = JSON.parse(window.localStorage.getItem(Constants.USER_KEY));
 this.orderRequest.customer_id = String(this.user.id);

 let selectedShippingMethod: ShippingMethod = JSON.parse(window.localStorage.getItem(Constants.SELECTED_SHIPPING_METHOD));
 if (selectedShippingMethod) {
 let shippingTotal = 0;
 for (let ci of this.cartItems) {
 if (!ci.product.shipping_cost_use_global && ci.product.shipping_cost != 1)
 shippingTotal = shippingTotal + ci.product.shipping_cost;
 }
 if (this.shippingChargeGlobal != -1) {
 shippingTotal = shippingTotal + this.shippingChargeGlobal;
 }
 this.orderRequest.shipping_lines = new Array<ShippingLine>();
 this.orderRequest.shipping_lines.push(new ShippingLine(selectedShippingMethod.method_id, selectedShippingMethod.method_title, String(shippingTotal)));
 }

 this.orderRequest.line_items = this.cartItems;
 for (let item of this.orderRequest.line_items) {
 item.product = null;
 }

 this.translate.get('order_creating').subscribe(value => {
 this.presentLoading(value);
 });
 let coupon: Coupon = JSON.parse(window.localStorage.getItem(Constants.SELECTED_COUPON));
 let subscription: Subscription = this.service.createOrder(window.localStorage.getItem(Constants.ADMIN_API_KEY), this.orderRequest).subscribe(data => {
 this.orderId = data.id;
 if (coupon) {
 this.applyCoupon(coupon);
 } else {
 this.orderPlaced();
 }
 }, err => {
 console.log(err);
 this.dismissLoading();
 let orderId = Helper.extractOrderIdFromError(err);
 if (orderId != -1) {
 this.orderId = orderId;
 if (coupon) {
 this.applyCoupon(coupon);
 } else {
 this.orderPlaced();
 }
 } else {
 this.translate.get('order_failed').subscribe(value => {
 this.showToast(value);
 });
 this.appCtrl.getRootNav().setRoot(HomePage);
 }
 });
 this.subscriptions.push(subscription);
 }
	}

	applyCoupon(coupon) {
 let couponSubs: Subscription = this.service.applyCouponCode(window.localStorage.getItem(Constants.ADMIN_API_KEY), String(this.orderId), coupon.code).subscribe(data => {
 this.couponApplied = true;
 window.localStorage.removeItem(Constants.SELECTED_COUPON);
 this.translate.get('confirm_order_coupon_applied').subscribe(value => {
 this.showToast(value);
 });
 this.orderPlaced();
 }, err => {
 console.log(err);
 this.dismissLoading();
 });
 this.subscriptions.push(couponSubs);
	}

	orderPlaced() {
 this.dismissLoading();
 if (this.selectedPaymentGateway.id && this.selectedPaymentGateway.id === "cod") {
 this.clearCart();
 this.navCtrl.setRoot(PlacedPage);
 } else if (this.selectedPaymentGateway.id === "pumcp" || this.selectedPaymentGateway.id === "payuindia") {
 this.initPayUMoney();
 } else {
 this.translate.get('order_placed_cod').subscribe(value => {
 this.showToast(value);
 });
 this.clearCart();
 this.navCtrl.setRoot(PlacedPage);
 }
	}

	initPayUMoney() {
 let name = this.user.first_name && this.user.first_name.length ? this.user.first_name : this.user.username;
 let mobile = this.user.username;
 let email = this.user.email;
 let bookingId = String(Math.floor(Math.random() * (99 - 10 + 1) + 10)) + this.orderId;
 let productinfo = this.orderId;
 let salt = this.config.payuSalt;
 let key = this.config.payuKey;
 let amt = this.couponApplied ? this.total : this.totalItems;
 let string = key + '|' + bookingId + '|' + amt + '|' + productinfo + '|' + name + '|' + email + '|||||||||||' + salt;
 let encrypttext = sha512(string);

 //let url = "payumoney/payuBiz.html?amt=" + amt + "&name=" + name + "&mobileNo=" + mobile + "&email=" + email + "&bookingId=" + bookingId + "&productinfo=" + productinfo + "&salt=" + salt + "&key=" + key;
 let url = "payumoney/payuBiz.html?amt=" + amt + "&name=" + name + "&mobileNo=" + mobile + "&email=" + email + "&bookingId=" + bookingId + "&productinfo=" + productinfo + "&hash=" + encrypttext + "&salt=" + salt + "&key=" + key;

 let options: InAppBrowserOptions = {
 location: 'yes',
 clearcache: 'yes',
 zoom: 'yes',
 toolbar: 'no',
 closebuttoncaption: 'back'
 };
 const browser: any = this.iab.create(url, '_blank', options);
 browser.on('loadstop').subscribe(event => {
 browser.executeScript({
 file: "payumoney/payumoneyPaymentGateway.js"
 });

 if (event.url == "http://localhost/success.php") {
 this.paymentSuccess();
 browser.close();
 }
 if (event.url == "http://localhost/failure.php") {
 this.paymentFailure();
 browser.close();
 }
 });
 browser.on('exit').subscribe(event => {
 if (!this.paymentDone && !this.paymentFailAlerted) {
 this.paymentFailure();
 }
 });
 browser.on('loaderror').subscribe(event => {
 this.showToast('something_went_wrong');
 });
	}

	paymentFailure() {
 this.paymentFailAlerted = true;
 let subscription: Subscription = this.service.updateOrder(window.localStorage.getItem(Constants.ADMIN_API_KEY), String(this.orderId), new OrderUpdateRequest('cancelled')).subscribe(data => {
 }, err => {
 console.log(err);
 });
 this.subscriptions.push(subscription);

 this.translate.get(['payment_fail_title', 'payment_fail_message', 'ok']).subscribe(res => {
 let alert = this.alertCtrl.create({
 title: res.payment_fail_title,
 message: res.payment_fail_message,
 buttons: [{
 text: res.ok,
 role: 'cancel',
 handler: () => {
 this.done();
 console.log('Okay clicked');
 }
 }]
 });
 alert.present();
 });
	}

	paymentSuccess() {
 this.paymentDone = true;
 this.clearCart();
 this.translate.get('just_a_moment').subscribe(value => {
 this.presentLoading(value);
 });
 let subscription: Subscription = this.service.updateOrder(window.localStorage.getItem(Constants.ADMIN_API_KEY), String(this.orderId), { set_paid: true }).subscribe(data => {
 this.done();
 }, err => {
 this.done();
 this.paymentSuccess();
 console.log(err);
 });
 this.subscriptions.push(subscription);
	}

	done() {
 if (!this.placedPagePushed) {
 this.placedPagePushed = true;
 this.dismissLoading();
 this.appCtrl.getRootNav().setRoot(this.paymentFailAlerted ? HomePage : PlacedPage);
 }
	}

	private presentLoading(message: string) {
 this.loading = this.loadingCtrl.create({
 content: message
 });

 this.loading.onDidDismiss(() => { });

 this.loading.present();
 this.loadingShown = true;
	}

	private dismissLoading() {
 if (this.loadingShown) {
 this.loadingShown = false;
 this.loading.dismiss();
 }
	}

	private presentErrorAlert(msg: string) {
 let alert = this.alertCtrl.create({
 title: 'Error',
 subTitle: msg,
 buttons: ['OK']
 });
 alert.present();
	}

	showToast(message: string) {
 let toast = this.toastCtrl.create({
 message: message,
 duration: 3000,
 position: 'bottom'
 });
 toast.onDidDismiss(() => {
 console.log('Dismissed toast');
 });
 toast.present();
	}

	clearCart() {
 let cartItems = new Array<CartItem>();
 window.localStorage.setItem('cartItems', JSON.stringify(cartItems));
	}
}