After rinsing your chickpeas, make sure to shake off as much of the water as you can. Add the chickpeas into a bowl and mash with the back of a fork or a potato masher. (It's okay to leave some texture.)
Add remaining ingredients and stir to combine. You may wish to add a little more mayo for a creamier chickpea salad. Add salt and pepper to taste. How much salt will depend on how salty your brand of canned chickpeas and vegan mayo are.
Enjoy right away on a sandwich or vegan "tuna" melt, or store in an airtight container in the fridge for up to 5 days.