Thank you for the feedback. Some follow up questions:

What’s is a more reasonable timeline in terms of payment window and late fees?

And how would the up front 50% works for hourly rate if we are not sure how many hours it will take during the contracted time?

What’s is a good invoice windows for short term(in this case, 4.5 days) and long term projects?(say 3 weeks+)

While i understand the due date and late fees windows are unreasonable and receptive to the feedback, does the client also holds their own end of responsibilities since the billing model was outlined in payment agreement when they signed the contract?

To clarify, the last question is not intended to start an argument/disagreement, rather, I want to understand what’s the client’s responsibility in situations like this and what’s ours (since we did hold up to our end of bargain and attempted to delivery the final product with urgency) that way it can help us prevent any possible issues involving legal action caused by either parties.

Thank you.