acf location field
// Method 1: Filter.
function my_acf_google_map_api( $api ){
$api['key'] = 'xxx';
return $api;
}
add_filter('acf/fields/google_map/api', 'my_acf_google_map_api');
// Method 2: Setting.
function my_acf_init() {
acf_update_setting('google_api_key', 'xxx');
}
add_action('acf/init', 'my_acf_init');