One of Andrew's ledgers survives in which he recorded a series of accounts he opened with Scottish clients who sent money and goods to him in Flanders, often to fund special purchases.
A letter from Andrew to a Scottish client survived with the ledger, advising hides would sell best at Eastertide 1502; he wrote,"Thar standis yet ii sekkis of woll of youris unsauld, and quhen thai are sauld, I shall send you your reckoning of all things between us.
Please you to wit that here is an evil mercat, sa help me God, except your woll, ... Hydis, I trow, shall be the best merchandise that come here at Pasche, for thar is many folkis that speris (ask) about thaim"(modernised) There stands yet 2 sacks of wool of yours unsold, and when they are sold, I shall send you your reckoning of all things between us.
Hides (skins), I believe, shall be the best merchandise that come here at Eastertide, for there is many folk that ask for them[7]Halyburton's account for James Stewart, Duke of Ross and Archbishop of St Andrews, includes a payment in September 1497 apparently for letters sent to Margaret of York from Perkin Warbeck and his wife, Lady Catherine Gordon, who was known as the White Rose, "Item, gyffyn Davy Rattrye quhen he passed to (blank) with the quhit ros lettrys to my lady, 10 shillings.
[10] Halyburton paid money to the Italian merchant and financier Jerome Frescobaldi, in Antwerp and Bruges, on behalf of his clients and business partners.
'[12] On 31 December 1507, James IV appointed John Francis as 'Conservator of the Privileges in Flanders, Brabant, Zeeland, and Holland', to replace Andrew, who had died.
[16][17] This was possibly Peerken Bovelant, an apprentice of Goswijn van der Weyden in Antwerp,[18] who joined the Guild of St Luke in 1503.
[21][22] Cornelia Bening's mother Katheline was a daughter (or sister or niece) of Hugo van der Goes (d. 1482), who had painted an altarpiece for Edinburgh's Trinity College Kirk.
His sister Helen Halyburton was married to Laurence Taillefer who was joint 'Customar of Edinburgh' with Andrew Moubray senior.
His house on the north side of the Royal Mile was granted to John Mossman, as attorney of Andrew's son, Thomas Haliburton.