Fix Stripe customer creation with no email (#4599)

* Fallback to billing email when user email is empty

* Add changelog entries

* Initialize $email variable closer to where it's used

* Fix changelog entry position

---------

Co-authored-by: daledupreez <[email protected]>

Author: malithsen

changelog.txt

@@ -11,6 +11,7 @@
 * Tweak - Small improvements to e2e tests
 * Fix - Fix unnecessary Stripe API calls when rendering subscription details
 * Add - Adds a new action (`wc_stripe_webhook_received`) to allow additional actions to be taken for webhook notifications from Stripe
+* Fix - Allow checkout for logged-in users without an email in their account when a billing email is provided
 
 = 9.8.1 - 2025-08-15 =
 * Fix - Remove connection type requirement from PMC sync migration attempt

includes/class-wc-stripe-customer.php

@@ -169,11 +169,18 @@ protected function generate_customer_request( $args = [] ) {
 				$billing_last_name = get_user_meta( $user->ID, 'last_name', true );
 			}
 
+			$email = $user->user_email;
+
+			// If the user email is not set, use the billing email.
+			if ( empty( $email ) ) {
+				$email = $this->get_billing_data_field( 'billing_email', $args );
+			}
+
 			// translators: %1$s First name, %2$s Second name, %3$s Username.
 			$description = sprintf( __( 'Name: %1$s %2$s, Username: %3$s', 'woocommerce-gateway-stripe' ), $billing_first_name, $billing_last_name, $user->user_login );
 
 			$defaults = [
-				'email'       => $user->user_email,
+				'email'       => $email,
 				'description' => $description,
 			];
 

readme.txt

@@ -121,5 +121,6 @@ If you get stuck, you can ask for help in the [Plugin Forum](https://wordpress.o
 * Tweak - Small improvements to e2e tests
 * Fix - Fix unnecessary Stripe API calls when rendering subscription details
 * Add - Adds a new action (`wc_stripe_webhook_received`) to allow additional actions to be taken for webhook notifications from Stripe
+* Fix - Allow checkout for logged-in users without an email in their account when a billing email is provided
 
 [See changelog for full details across versions](https://raw.githubusercontent.com/woocommerce/woocommerce-gateway-stripe/trunk/changelog.txt).