function custom_min_income_endpoint($data) { $post_id = $data['id']; $income = get_post_meta($post_id, 'min_income', true); return new WP_REST_Response(['min_income' => $income ? $income : 'not available'], 200); } add_action('rest_api_init', function() { register_rest_route('custom/v1', '/min_income/(?P\d+)', [ 'methods' => 'GET', 'callback' => 'custom_min_income_endpoint', 'permission_callback' => '__return_true' ]); });

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