Hi @sanjay-cygnet – rather than waiting for a certain time and polling the API, we recommend listening to the customer_mass_payment_completed webhook and then checking the masspayment details via the API. You will then see in the items list that some or all were successful in creating transfers. For the ones that failed, you’ll find a failure reason attached it it, like the funding-source is removed, or the customer is deactivated. You will need to correct those issues and then attempt to create another masspayment with those items only, or create individual transfers for them.
I’d recommend checking out this post by Cory which describes creating and handling masspayments step-by-step - Mass Payments - Pay 5,000 People in Five Simple Steps