i am currently using substrate full node . and i have created non native custom tokens through assets like of name KAR . when i transfer these custom tokens i.e KAR from one account to another the transaction fees is deducting through native tokens . can anyone please tell me how we can use these non native (custom) tokens i.e KAR for transaction fees and where i have to make changes to do this .

i have followed this and made an Api for SignedExtension but still the fees is getting deducted from the native token the link for my api is api



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