Certified organic red papaya is ripe when skin is green/yellow. When ripe, cut fruit should have bright orange/red flesh. The fruit is ripe when yield to gentle pressure.
To ripen fruit, store between 20 – 25°C.
The unripe papaya is perfect for the classic south east Asian green papaya salad
Here's renowned Thai chef, David Thompson's recipe. Of course, I'd swap out conventional for organic😉:
https://www.gourmettraveller.com.au/recipe/chefs-recipes/david-thompsons-green-papaya-salad-8488/
Once ripe, store fruit in the refrigerator.