This creeper was growing around a tree in our yard. We separated the vines and put them through/around the iron handrail and fence visible in the images below.
The vines are between 2 and 5 metres long, from a plant several years old. They began budding and showing the flowers in the top image, which are a white shading into pink at the centre, with petals between 8 and 25 millimetres long. We have also noticed today the bulk of what appears to be fruit or seed pods, shown in the bottom image. They are a pale to regular green with a surface resembling that of feijoa, and are approximately the same size as that fruit.
What plant is this? What should I be sure to know and do about it?