Display ECE button with trial subscription in the cart

client/express-checkout/blocks/components/express-checkout-container.js

@@ -8,7 +8,10 @@ import { Elements } from '@stripe/react-stripe-js';
  * Internal dependencies
  */
 import ExpressCheckoutComponent from './express-checkout-component';
-import { getExpressCheckoutButtonAppearance } from 'wcpay/express-checkout/utils';
+import {
+	getExpressCheckoutButtonAppearance,
+	getExpressCheckoutData,
+} from 'wcpay/express-checkout/utils';
 import '../express-checkout-element.scss';
 
 const ExpressCheckoutContainer = ( props ) => {
@@ -21,7 +24,9 @@ const ExpressCheckoutContainer = ( props ) => {
 	const options = {
 		mode: 'payment',
 		paymentMethodCreation: 'manual',
-		amount: billing.cartTotal.value,
+		amount: getExpressCheckoutData( 'has_trial_subscription' )
+			? 1300 // TODO: Find a way to get the cart total with trial subscription.
+			: billing.cartTotal.value,
 		currency: billing.currency.code.toLowerCase(),
 		appearance: getExpressCheckoutButtonAppearance(),
 	};

includes/express-checkout/class-wc-payments-express-checkout-button-handler.php

@@ -255,6 +255,7 @@ public function scripts() {
 			'product'            => $this->express_checkout_helper->get_product_data(),
 			'total_label'        => $this->express_checkout_helper->get_total_label(),
 			'is_checkout_page'   => $this->express_checkout_helper->is_checkout(),
+			'has_trial_subscription' => $this->express_checkout_helper->has_trial_subscription(),
 		];
 
 		WC_Payments::register_script_with_dependencies( 'WCPAY_EXPRESS_CHECKOUT_ECE', 'dist/express-checkout', [ 'jquery', 'stripe' ] );

includes/express-checkout/class-wc-payments-express-checkout-button-helper.php

@@ -363,6 +363,28 @@ public function is_product_subscription( WC_Product $product ): bool {
 			|| 'variable-subscription' === $product->get_type();
 	}
 
+	/**
+	 * Returns true if cart contains a subscription product with a trial period, false otherwise.
+	 *
+	 * @psalm-suppress UndefinedClass
+	 */
+	public function has_trial_subscription(): bool {
+		if ( ! class_exists( 'WC_Subscriptions_Product' ) ) {
+			return false;
+		}
+
+		// TODO: WC_Subscriptions_Cart may provide a better way to check for trial subscriptions.
+		foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
+			$product = apply_filters( 'woocommerce_cart_item_product', $cart_item['data'], $cart_item, $cart_item_key );
+
+			if ( WC_Subscriptions_Product::get_trial_length( $product ) > 0 ) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+
 	/**
 	 * Checks whether Payment Request Button should be available on this page.
 	 *
@@ -436,9 +458,12 @@ public function should_show_express_checkout_button() {
 		}
 
 		// Cart total is 0 or is on product page and product price is 0.
-		// Exclude pay-for-order pages from this check.
+		// Exclude pay-for-order pages and trial subscriptions from this check.
 		if (
-			( ! $this->is_product() && ! $this->is_pay_for_order_page() && 0.0 === (float) WC()->cart->get_total( 'edit' ) ) ||
+			( ! $this->is_product()
+				&& ! $this->is_pay_for_order_page()
+				&& ! $this->has_trial_subscription() // TODO: double-check this condition.
+				&& 0.0 === (float) WC()->cart->get_total( 'edit' ) ) ||
 			( $this->is_product() && 0.0 === (float) $this->get_product()->get_price() )
 
 		) {
@@ -528,9 +553,10 @@ public function has_allowed_items_in_cart() {
 			 *
 			 * @psalm-suppress UndefinedClass
 			 */
-			if ( class_exists( 'WC_Subscriptions_Product' ) && WC_Subscriptions_Product::is_subscription( $_product ) && $_product->needs_shipping() && WC_Subscriptions_Product::get_trial_length( $_product ) > 0 ) {
-				return false;
-			}
+			// TODO: Double-check this condition.
+			// if ( class_exists( 'WC_Subscriptions_Product' ) && WC_Subscriptions_Product::is_subscription( $_product ) && $_product->needs_shipping() && WC_Subscriptions_Product::get_trial_length( $_product ) > 0 ) {
+			// 	return false;
+			// }
 		}
 
 		// We don't support multiple packages with Payment Request Buttons because we can't offer a good UX.
@@ -766,7 +792,8 @@ private function is_product_supported() {
 		if ( is_null( $product )
 			|| ! is_object( $product )
 			|| ! in_array( $product->get_type(), $this->supported_product_types(), true )
-			|| ( class_exists( 'WC_Subscriptions_Product' ) && $product->needs_shipping() && WC_Subscriptions_Product::get_trial_length( $product ) > 0 ) // Trial subscriptions with shipping are not supported.
+			// TODO: Double-check this condition.
+			// || ( class_exists( 'WC_Subscriptions_Product' ) && $product->needs_shipping() && WC_Subscriptions_Product::get_trial_length( $product ) > 0 ) // Trial subscriptions with shipping are not supported.
 			|| ( class_exists( 'WC_Pre_Orders_Product' ) && WC_Pre_Orders_Product::product_is_charged_upon_release( $product ) ) // Pre Orders charge upon release not supported.
 			|| ( class_exists( 'WC_Composite_Products' ) && $product->is_type( 'composite' ) ) // Composite products are not supported on the product page.
 			|| ( class_exists( 'WC_Mix_and_Match' ) && $product->is_type( 'mix-and-match' ) ) // Mix and match products are not supported on the product page.