Subscribing is basically participating. In the unlikely event that you cannot participate, please cancel your registration with the organization.
You will not always get your registration fee back. You can request this at the organization of the competition, they deal with the registration fees, but according to the terms of Athletics.app they are not obliged to do anything.
The contact information of the organization can be found here:
https://www.athletics.app/home/contact/ (choose 'I am a competitor / registrant of an event')
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This has been automatically translated into English