Common causes
- Double-clicking a checkout button, or checking out in two tabs.
- Trying to change plans through checkout instead of the plan-change controls.
How to fix it
- Use the billing page's manage-plan controls to change plan or payment method.
- If you believe you were charged twice, contact support: duplicate checkouts are refused before charging, so a real double charge is a bug we want to know about.
Still stuck?
Ask support and mention RU-2005: the code pins down the exact refusal path, so you skip the diagnostic back-and-forth.