Are special credentials required?

Are credentials required in order to perform the tasks planned for the study? If all participants are to use the same login, can they interfere with each other? Do the study participants have to provide personal data, such as health information or banking details? If the study participants are required to create new accounts, should a list of these be provided to the study sponsor afterward, in order to delete the accounts?

Another aspect to take into consideration is whether the participants will need to have credentials that are only available to residents of the country in which the study is being run. Some government or banking apps/websites, for example, are accessible only to registered residents of the respective countries.