Month-to-month is deliberate. A service that has to lock you in is telling you something about its confidence in the next month's results.
Bespoke arrangements exist for unusual operations, but nothing about the standard offer requires one.
Answer
Do I have to sign a retainer or a long-term contract?
No retainer required, and the engagement is month to month. You pay per booked appointment rather than a recurring fee.
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Browse anonymised venues that want machines, or list your location free and let operators come to you. Our team makes every introduction by phone.