His first diplomatic charge was to congratulate the Archduke Albert VII of Austria and Isabella Clara Eugenia on their marriage while they were passing through Milan in 1599. in 1600, he was sent to congratulate the Emperor Ferdinand II on his marriage to Maria Anna of Bavaria and also negotiate concerning the Uskoks.
In January 1608, the Council of Ten sentenced him to one year in prison, forbade him from knowing state secrets and banned him from going abroad.
In 1610, the Spanish ambassador, Alfonso de la Cueva, recommended Badoer be paid an annual pension of 2,000 ducats for his spying services.
He also served the Papacy and the Jesuits at various times and was in contact with Duke Charles Emmanuel of Savoy.
He spent time in Brussels, where Alfonso de la Cueva was the Spanish ambassador.
[2] In the summer of 1622, Badoer was in Madrid working for the election of Maffeo Barberini as Pope Urban VIII, who rewarded him with benefices in the diocese of Pavia, Ferrara and Cervia after he took holy orders.
In 1626, after France's treaty of Monzón with Spain, the Venetians made a second attempt on his life at Mâcon.