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also, this method throws an exception if more than one row is returned: https://docs.sqlalchemy.org/en/14/orm/query.html#sqlalchemy.orm.Query.one_or_none - maybe i don't understand the logic, but can we have a situation where 2 intentional duplicates exist and we are applying for more - would not this throw an exception
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yes please fix that exception, Rajan
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updated code to check on only for pending payment state if request stuck for payment about 5 mins or more then user can send in another request, once nr is fully completed with payment then system will not allow duplicates not even intentional ones.
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looks good to me