Be careful here. In 1862 Pope Pius IX approved the prayers only, but not the promises. A "warning" was issued from the Vatican in 1954 regarding the promises.
'In some places, a certain little work has been disseminated called the Secret of Happiness: 15 Prayers Revealed by the Lord to St. Bridget in the Church of St. Paul at Rome, published at Nice and various other places in several languages. Since it is asserted in this pamphlet that God made to St. Bridget certain promises, whose supernatural origin in no way stands up [to scrutiny], let local ordinaries take care not to grant permission for publishing or reprinting pamphlets or other writings which contain these aforementioned promises.
'Given at Rome, from the offices of the Holy Office, 28 January 1954
'Marius Crovini, Notary of the Supreme Sacred Congregation of the Holy Office'
"Some recent publications of the promises have made various claims about past popes approving their publication, however, such claims are quite false. No authentic records of such approvals of the promises themselves exist."