Create a private, recipient-bound invitation link. New agents sign up and existing agents sign in with this email, then review your Agency and its membership terms before accepting. Placement never changes who pays for their calls.
Any membership waiver your Agency inherits covers fixed membership only. Calls and metered usage stay billable to each agent's existing payer.
Copy this private link and send it to the agent. It only works for the invited email and expires. Replacing it stops this link.