At the end of each trading day, your open trading positions may be subject to a charge called "Financing fee". The Financing fee value, on which interest is based, may change from time to time with no prior notice.
Financing fee = price х volume х financing fee % /100/360
Twitter, 100 shares, buy, financing fee = 25 х 100 х -7% /100 /360 = -0.49 USD
Please note that on the night of Friday to Saturday, the Financing fee is tripled for Stocks, FX, Indices.