Compensation or other study incentives are typically based on your adherence to the study requirement and the completion of required tasks in a timely manner.
Each study will tell you exactly what you need to do to be considered adherent in your study on your study homepage. Each study may have different criteria—some require a minimum adherence percentage (e.g. 80–90%) to qualify for compensation. Some studies will also require you to complete and return at-home tests, like a nasal swab or dried blood spot kit.
The exact details are usually shared:
During onboarding
In the Study Homepage under the study description or in the Adherence section.
Or in your informed consent form