John Trew
First you need a valid binding contract, then if they don't pay simply take it to court and forgo the lien. Liens are more for secured loans or judgments that can't be collected because the defendant has limited/protected income and assets. If you file a PPSA without a valid contract or judgment it's basically an abuse of the system and can be thrown out, possibly with costs and damages. Also only a PERSON or corporation can contract, sue or lien...