Hello, and welcome to this Apple (user-to-user) Community :-)
Re: "Survival : I am too poor to update apps"
Commiserations on your plight!
This "question and reply" method of communication is rather limited in what we other Apple customers can provide to assist.
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Re: "Any work around?"
Fortunately. much of Apple's software updates for free, once you have the hardware model with an Apple Account, to install it on.
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Re: "I have a “problem with past billing information” barrier"
Wondering if there is some way to get beyond that barrier ... I take it that the amount owed to Apple is greater than your current account balance.
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First: there is a support article that can assist in sizing up the situation.
If you do not know already: An accurate picture of where you stand may give you courage, and an overview of what is actually needed to solve the barrier-issue.
Perhaps a family member or friend can assist, if there's no other way just now.
See what to do: If a message says 'billing problem with previous purchase' or 'verification required' - Apple Support
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If more support is needed:
Billing and Subscriptions Support Team have a "Get Support" link at the bottom of their webpage (link below)::
Subscriptions and Billing - Official Apple Support