If you have given them permission to do NEFT then you have to enter the specific details.
Follow the instruction to set your payment method to NEFT.
1. Login to Flipkart Affiliate dashboard.
2. Go to My account tab.
3. Click on Upload Files.
4. Upload PAN card and Cancelled cheque.
After this the team will verify your account. And then you'd be able to get the money for your affiliate account money into the bank.
Do note that if your account is not verified then you only get the option of voucher. And in order to get money deposited you need to be verified. So by default you can get this as a voucher. Just contact the affiliate team support. And they can convert the account earning into voucher.