In a medium pot, bring water to a boil. Add the green beans and cook for 3-4 minutes until tender-crisp. Drain and immediately transfer to a bowl of ice water to stop the cooking process. Once cooled, drain again and set aside.
In a large bowl, combine the chickpeas, black beans, green beans, red bell pepper, corn, red onion, and cilantro.
In a separate small bowl, whisk together the miso paste, sesame oil, rice vinegar, soy sauce, honey or maple syrup, ginger, and garlic until smooth. Season with salt and pepper to taste.
Pour the dressing over the bean mixture and toss gently to combine.
Chill the salad in the refrigerator for at least 30 minutes before serving to allow the flavors to meld.
Serve chilled or at room temperature.