** Shares of Butn Ltd BTN.AX jump as much as 12.9% to
A$0.35, their highest since Oct. 21
** B2B payments platform secures additional funding of A$8.5
mln ($6.14 mln) to purchase eligible receivables urn:newsml:reuters.com:*:nASX3MvL9g
** Says cost of debt is about 200 basis points below co's
FY21 weighted cost of debt
** BTN stock on track for third straight session of gain
** Stock down 38% since June debut, as of last close
($1 = 1.3845 Australian dollars)
(Reporting by Jaskiran Singh in Bengaluru)
((Jaskiran.Singh@thomsonreuters.com;))