diff --git a/src/Payment/Revenue.php b/src/Payment/Revenue.php
index 20ab8dd2..f575e10e 100644
--- a/src/Payment/Revenue.php
+++ b/src/Payment/Revenue.php
@@ -283,8 +283,9 @@ class Revenue {
             $where[] = 'status = %s';
             $params[] = $status;
         }
-        $currency = sanitize_key((string) ($args['currency'] ?? ''));
-        if (in_array($currency, ['CNY', 'points'], true)) {
+        $currency = strtolower(sanitize_key((string) ($args['currency'] ?? '')));
+        if (in_array($currency, ['cny', 'points'], true)) {
+            $currency = $currency === 'points' ? 'points' : 'CNY';
             $where[] = 'currency = %s';
             $params[] = $currency;
         }
@@ -317,8 +318,9 @@ class Revenue {
 
         $where = 'author_id = %d';
         $params = [$user_id];
-        $currency = sanitize_key((string) ($args['currency'] ?? ''));
-        if (in_array($currency, ['CNY', 'points'], true)) {
+        $currency = strtolower(sanitize_key((string) ($args['currency'] ?? '')));
+        if (in_array($currency, ['cny', 'points'], true)) {
+            $currency = $currency === 'points' ? 'points' : 'CNY';
             $where .= ' AND currency = %s';
             $params[] = $currency;
         }
@@ -388,8 +390,9 @@ class Revenue {
             $where[] = 'post_id = %d';
             $params[] = $post_id;
         }
-        $currency = sanitize_key((string) ($args['currency'] ?? ''));
-        if (in_array($currency, ['CNY', 'points'], true)) {
+        $currency = strtolower(sanitize_key((string) ($args['currency'] ?? '')));
+        if (in_array($currency, ['cny', 'points'], true)) {
+            $currency = $currency === 'points' ? 'points' : 'CNY';
             $where[] = 'currency = %s';
             $params[] = $currency;
         }
@@ -406,7 +409,8 @@ class Revenue {
             }
         }
         $where_sql = $where ? 'WHERE ' . implode(' AND ', $where) : '';
-        $total = (int) ($params ? $wpdb->get_var($wpdb->prepare("SELECT COUNT(*) FROM {$this->table()} {$where_sql}", $params)) : $wpdb->get_var("SELECT COUNT(*) FROM {$this->table()}"));
+        $count_sql = "SELECT COUNT(*) FROM {$this->table()} {$where_sql}";
+        $total = (int) ($params ? $wpdb->get_var($wpdb->prepare($count_sql, $params)) : $wpdb->get_var($count_sql));
         $items_params = array_merge($params, [$limit, $offset]);
         $items = $wpdb->get_results($wpdb->prepare("SELECT * FROM {$this->table()} {$where_sql} ORDER BY created_at DESC LIMIT %d OFFSET %d", $items_params), ARRAY_A);
         return ['items' => $items ?: [], 'total' => $total, 'page' => (int) floor($offset / $limit) + 1, 'max_pages' => (int) ceil(max(1, $total) / $limit)];