Fix "undefined array key 'label' warning" (#4519)

* Guard against undefined custom field label

* Add readme and changelog entries

* Update changelog.txt

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

* Update readme.txt

---------

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

Cherry-picked from ea2a035

Author: annemirasol

changelog.txt

@@ -3,6 +3,7 @@
 = 9.7.1 - xxxx-xx-xx =
 * Add - Add state mapping for Lithuania in express checkout
 * Tweak - Check for checkout validation error before creating a payment method in Stripe
+* Fix - Fix required field error message and PHP warning for custom checkout fields that don't have a label
 
 = 9.7.0 - 2025-07-21 =
 * Update - Removes BNPL payment methods (Klarna and Affirm) when other official plugins are active

includes/payment-methods/class-wc-stripe-express-checkout-custom-fields.php

@@ -59,7 +59,7 @@ public function process_custom_checkout_data( $order, $request ) {
 				$required_field_errors[] = sprintf(
 					/* translators: %s: field name */
 					__( '%s is a required field.', 'woocommerce-gateway-stripe' ),
-					$field['label']
+					empty( $field['label'] ) ? $key : $field['label']
 				);
 			}
 		}
@@ -197,7 +197,7 @@ public function get_custom_checkout_fields( $context = '' ) {
 				$additional_fields            = $checkout_fields->get_additional_fields();
 				foreach ( $additional_fields as $field_key => $field ) {
 					$block_custom_checkout_fields[ $field_key ] = [
-						'label'    => $field['label'],
+						'label'    => $field['label'] ?? '',
 						'type'     => $field['type'] ?? 'text',
 						'location' => $checkout_fields->get_field_location( $field_key ),
 						'required' => $field['required'] ?? false,
@@ -222,7 +222,7 @@ public function get_custom_checkout_fields( $context = '' ) {
 					}
 
 					$classic_custom_checkout_fields[ $field_key ] = [
-						'label'    => $field['label'],
+						'label'    => $field['label'] ?? '',
 						'type'     => $field['type'] ?? 'text',
 						'location' => $fieldset,
 						'required' => $field['required'] ?? false,

readme.txt

@@ -113,6 +113,7 @@ If you get stuck, you can ask for help in the [Plugin Forum](https://wordpress.o
 = 9.7.1 - xxxx-xx-xx
 * Add - Add state mapping for Lithuania in express checkout
 * Tweak - Check for checkout validation error before creating a payment method in Stripe
+* Fix - Fix required field error message and PHP warning for custom checkout fields that don't have a label
 
 = 9.7.0 - 2025-07-21 =