Yes, you can. For example, you can offer your customer a free trial for 3 days. However, you are not allowed to charge your customer for a trial period. It is not possible to charge 3€ for the first 3 days and later increase the charge to 80€.
Here you can find additional resources that may help you in the process and tell you more about payment processing.
If you haven't found answers to your questions here or need any further assistance, don't hesitate to contact us.