This is a gradient color. If selected, the background color will be a gradient color. If not, the background color will be a monochrome background color.
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
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