how to add cheque management model
Please add some details on what exactly you want to manage with regard to cheques. Do you want to replicate the function of a physical chequebook? If yes, that should be a fairly simple customization.
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Iwant module of cheque that got wallet for pending or settled or rejected one
This feature is non-trivial and depends on the jurisdiction you’re in and then often the bank itself. In the US for example, most Banks don’t have a REST API and they delegate this to some third party service (like Plaid), if they have it all. The only bank-specific app I’m aware of the Marketplace is ICICI Bank Payouts Integration - Frappe Cloud Marketplace