async fn execute_batch(
token: &MarketingMailingListAccessToken,
ops: Vec<MailchimpOperation>,
timeout: Duration,
poll_interval: Duration,
) -> Result<Vec<MailchimpOpResult>>async fn execute_batch(
token: &MarketingMailingListAccessToken,
ops: Vec<MailchimpOperation>,
timeout: Duration,
poll_interval: Duration,
) -> Result<Vec<MailchimpOpResult>>