Refund of itc on exports of goods

I'm Mr anup here from sangam exports bangalore

Brief intro sir- we export peanut to other countries from India, we are based in karnataka state .
We procure from Andhra, tamilnadu ,maharashtra, Gujarat, karnataka so our suppliers from karnataka bill us with cgst 2.5% and sgst 2.5 % and all other states bill us directly Igst 5% and also we have some itc on services we take from cha, laboratory ,and some govt agencies which are mainly from tamilnadu so igst is applicable - so on this basis

AT PRESENT WE CLAIM ITC ON REFUNDS WITHOUT PAYMENT OF TAX (RFD-01 ) .  OUR FIRM SANGAM EXPORTS IS TOTALLY EXPORT TURNOVER ONLY NO LOCAL SALSES 100% EXPORTS

The queries regarding gst refund (ITC) for exports are listed as below

1) do we have any option to claim itc refund on our exports with payment of tax ? ( as mentioned in your youtube video that shipping bill will represent as the refund application) I'm asking this option to check because without payment of tax and claiming refund is a bit lengthy and involves lot of human intervention pls advise can we use this option of with payment of tax in our business scenario pls advise

2) for month of may 2021 we have zero exports no sales but we have some itc on purchase of goods and services so please advise how can we claim that refund amount ( we cannot generate statement 3 as no sales )

Pls advise .