Some of our users have described seeing an extra $1 on a credit card or banking app when initially signing up for the free 2-week trial. This is typically only seen for AMEX users, and it's a temporary authorization by our payment processor (not a charge) to ensure the card it valid. It is immediately reversed, but sometimes the reversal can take several days to complete. More information from Stripe, here:
LiveSky.com | Why Am I Seeing A $1 Charge On My Bank Statement?