Hylocereus undatus aka Cactus Creeper
It grows for me under shade cloth, not sure if it can take full sun.
It's a shame these don't stay open longer than a day or two.
The plant's leaves are a triangular shape & send out tough roots at the
nodes
which attach to anything also have nasty thorns. Could become evasive!
Cheers Wendy (zone 9/10)