If you have claimed an online payment job, you cannot request for the job poster to change the payment method from online payment to cash or direct bank transfer to your account on your own accord. Read more here.
However, if the job is "Poster tip", the Poster has the option to pay you either in cash or bank transfer directly to your bank account. Always ensure you have received the GoGet Fee and cost of goods before handing over the goods and completing the job. Read more about GoGet's Safety Policy here.