Each Matter channel in your workspace will be billed as an individual Matter account. If your Slack workspace has multiple Matter channels, each will be billed separately.
If a workspace member is in two or more Matter channels on our Pro Plan, they will be billed for membership in each channel. For example, if one user is in two Pro Matter channels, membership would be billed $5 per month, per channel ($10/month total) or $36 per year, per channel ($72/year total).

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