Here is a direct Notary Cafe url link to a GREAT Step-By-Step Guide by @rparker for a Non-Payment situation with a client:
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Also, remember to reach out to the Title/Escrow Company that is associated with the documents to advise them to the NON-PAYMENT status for your successfully provided professional services.
This places them on ALERT that the Signing Service [SS] is not paying their invoices & they may promptly choose NOT to hire that SS for future Signing Orders [SOs].
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In addition, this THEFT OF SERVICES post will elucidate the topic comprehensively for you: