Unpaid Freelance Work Dilemma

Summary

David, a freelancer, is dealing with a payment issue. He completed a project for a client who agreed to pay via PayPal after the projects completion. However, the client has not paid yet. There was no formal contract, but the agreement was made through email. David has not sent a formal invoice to the client and has not been able to reach the client through other means of communication.

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I'm sorry, ****, but I didn't understand your response. Could you please clarify the legal issue you're facing?
I have payment problem
Could you please specify what kind of payment problem you're facing? Is it related to a business transaction, personal loan, or something else?
I worked one project for client but he didn't pay money yet
What was the agreed payment method and terms in your contract with the client?
We agreed to pay on paypal
Did you have a written contract with your client outlining the payment terms and conditions?
No. I didn't
Do you have any written communication (like emails) where the client agreed to pay you for your work?
Yes. We just discussed on email and agreed to pay after finish project. But i didn't get money yet.
Did you send a formal invoice to the client after the completion of the project?
No. He didn't replay my message.
Have you tried reaching out to the client through other means of communication?