Tier 1 Billing Company Subscription Tier 2 Billing Company Subscription Tier 3 Billing Company Subscription Tier 4 Billing Company Subscription Tier 1 Billing Company Subscription – AR RhythmMonthly Charges Vary by Account usage as outlined in Subscriber Agreement. Sign up for Tier 2 Billing Company Subscription – AR RhythmMonthly Charges Vary by Account usage as outlined in Subscriber Agreement. Sign up for Tier 3 Coming Soon Tier 4 Coming Soon