On SendBoard for Trello's Privacy Page you can request and collect all the privacy and GDPR related information that SendBoard for Trello is providing.
The privacy policy by is a legal document or statement that discloses how SendBoard for Trello gathers, uses, discloses, and manges their customers' data.
The basis for SendBoard sharing, adding, uploading, hosting, accessing or sending personal data out of Europe. Vendors can also add a description of their own impact assessment for data transfers.