This option is available to premire and business account. my question is , can we charge back after payment is sent? is there any special requirement to use this service?
chargeback can only be done if you paying someone using your Credit Card... at paypal only Reversal is allowed... and anybody can Reverse a payment.... there is no special requirement needed... just setup a dispute and paypal will look after the dispute and after few days you may get the money back or you may not... depending on what proof the other party provided to paypal....
You cannot issue a chargeback since you need to load your account first, usually via check or bank transfer before you issue a mass pay. See https://www.paypal.com/us/cgi-bin/webscr?cmd=_batch-payment-works-outside