This is what a plain redirect gateway can't do. The plugin runs its own cron task,
viva_auto_bill, daily at 23:00.

What it does

• Finds due auto-debit invoices for clients who have a saved Viva recurring token.
• Groups them per client and per currency and charges the saved token unattended.
• Records each payment against the right invoice and emails the result.

Recurring works because the first payment is made with allowRecurring=true; Viva returns a
recurring-enabled transactionId that the plugin stores and reuses for renewals via a synchronous
POST /api/transactions/{transactionId}.

Requirement

Blesta's own cron must be running (Settings > Company > Automation). If the site cron is off, no
renewals are charged.