Prep Plugin for release on WordPress.org

Escape everything that should be escaped.
Add nonce checks where needed.
Sanitize all inputs.
Apply Code style changes across the codebase.
Correct many deprecation notices.
Optimize load order of many filters.

inc/checkout/class-line-item.php

@@ -1079,6 +1079,13 @@ class Line_Item implements \JsonSerializable {
 		$this->tax_label = $tax_label;
 	}
 
+	/**
+	 * @return string
+	 */
+	public function get_date_created(): string {
+		return $this->date_created;
+	}
+
 	/**
 	 * Returns the amount recurring in a human-friendly way.
 	 *
@@ -1164,7 +1171,7 @@ class Line_Item implements \JsonSerializable {
 		}
 
 		// phpcs:disable;
-		$query = $wpdb->prepare("
+		$query = $wpdb->prepare( "
 			SELECT m.wu_payment_id, m.meta_value as line_items, p.date_created
 			FROM {$wpdb->base_prefix}wu_paymentmeta as m
 			JOIN {$wpdb->base_prefix}wu_payments as p