The twitter account handle of the organization, starting with the '@' symbol. E.g.: @RAP_Asso. This is necessary in order to attribute the 'Twitter Card' to the correct account. See https://developer.twitter.com/en/docs/tweets/optimize-with-cards/overview/summary
Picture displayed in Twitter/Facebook cards when the link is posted to social networks. To be tested via https://cards-dev.twitter.com/validator and https://developers.facebook.com/tools/debug/