Timing for filing Bills - Goods and Services Tax - GST

If a buyer is doubtful about paying the bill amount, can I delay filing their invoice in GST until they make the payment? I have supplied goods/services to a buyer and raised an invoice, but there is uncertainty about whether they will pay. Can I wait to file this invoice in my GSTR-1 until the buyer makes the payment? Is it legally permissible to delay filing the invoice in GST until payment is received? What are the consequences of not filing the invoice within the prescribed time limit (30 days from the date of supply)? If I file the invoice and pay GST but the buyer defaults, can I claim a refund of the GST paid? What is the best way to handle this situation to remain GST-compliant while managing the risk of non-payment?