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For revolving credit facilities ,such as credit cards and overdraft, do not have a fixed term or repayment structure (cash flow)
So how Entities can calculate EIR, ECL Gross carrying amount?

you mentioned ECL, so I guess you are looking from a bank's perspective
to be honest, I don't know how they do it, but they have lots of data so it's probably feasible to develop sensible models
are you developing accounting policy for a newly incorporated bank or doing research?

PS. see also the discussion we had about recognition of fees:

viewtopic.php?f=4&t=200

Actually, I’m developing engine to calculate data that meet IFRS9
So I need to understanding IFRS 9 requirement clearly and mapping with real case
I read topic that you recommend and I see accounting that case because we also post account like that for all case ( follow interner law accounting)