Why Jupiter don't want to provide netbanking

On some websites, there is an option to pay through netbanking only. If someone only has a Jupiter account and wants to make payment on such a website, what will he do?
Many times the payment through debit card is shown as failed but money is deducted from the account. Very rarely this would happen when paying through netbanking.
What are the disadvantages to offering NetBanking for Jupiter?

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