Hi! A question about changing the tariff. I had $600 in my airtable account. And 27 collaborators have access to the database. I decided to switch to the Plus tariff, paid $ 300. I looked at the tariff options and realized that I needed a Pro tariff. The Pro tariff costs $600 for me, but I paid $300 half an hour ago and I want to pay another $300 to switch to Pro. How do I pay $300 to the Pro tariff, not $600?