Engagement
Price in contract
Project
Scoped build
A defined piece of work — platform, integration, or custom application. Scope, milestones, and price live in the contract.
Retainer
Ongoing operations
Monthly maintenance, infrastructure, and support. Billed against the same contract, not a software seat.
Usage
Metered pass-through
API tokens, telephony, and workspace seats appear as line items on the contract. You pay for what ran.