No, your participation in the loyalty programme is free.
Any additional costs incurred in the process of completing your registration and accessing the App (for example internet connection charges via your telephone operator and/or ISP provider) are borne by you. Accessing the App using an established Wi-Fi connection is recommended for both security reasons and to limit any potential data usage charges you might incur in the course of using the App.
You can find the full GivBax Rewards terms and conditions here.