When you purchase a recurring monthly plan (Growing Team or Big Team) and pay with a credit card, the first payment will be processed the morning following your purchase. Subsequent payments will be processed automatically on the date your plan recurs. For example, if you sign up and pay on July 1, the first payment will hit your card on July 2. Subsequent payments will be processed on August 1, September 1, etc.
The email receipt for your purchase will only go out when your card has been charged the following morning.
You will receive two separate emails after you set up your recurring payment. One will contain your receipt. The second will contain a confirmation that you have activated 'auto-renew', with links to cancel your recurring billing or change your billing preferences. Please keep the latter email for future reference.