I just repaired someone’s gas furnace by replacing the igniter switch. I had already had text between me and the customer, plus I was given the lead through home advisor. The repair was done on the 5th of February and I sent a QuickBooks invoice to customer. He had 30 days to pay but is there anything I need to do before the 30 days are up to insure payment? Once the 30 days are up, what are my next steps? The job was priced at $200, is it even worth it for me to try to file a mechanics lein? Any help would be greatly appreciated.