SMS Assist — independent third-party profile of a public API surface, by API Evangelist. SMS Assist (rebranded as Lessen) is a facilities maintenance, repair, and work-order management company. Its "One" Platform coordinates reactive and recurrent maintenance, turn/renovation projects, invoices, proposals, assets, and a nationwide vendor network fo
real-estate graphql webhooks company maintenance work-orders field-service facilities-management apis-json property-maintenance vendor-network
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Updated
Sep 4, 2026