Is it possible to get a Credit Card if you just miss the 30K minimum for one? Is it worth it getting one, are the cashbacks worth it, is there interest?

Can try?

Personally, it will either be the person contacting you directly for further clarification or, contact already and it's a no go

I don't think the $30k minimum income is a hard requirement, think you can just give it a shot and see if they approves it.

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So long you pay on time, there's no interest on payments - there might be annual card fees depending on which card you go for though.

Just try. If successfully, make sure you pay bill on time.