At $DAYJOB we run a SaaS with a free trial, and immediately start billing for the following month after the trial expires. However, we don't ask for credit car

At $DAYJOB we run a SaaS with a free trial, and immediately start billing for the following month after the trial expires. However, we don't ask for credit card details until the first payment, so, there's no risk that a user would be charged accidentally. It also reduces onboarding friction as a credit card isn't required for signup. If a user doesn't want to continue after the trial, we advise them to disregard the invoice.