Hello Sir,
Good morning Hope you are doing good.
Forgot password OTP can be sent to the mobile numbers registered to you via firebase Auth API easily or with any 3rd party API like cheap bazaar,
I have done forgot password feature in some of my apps, TourIndia, MomBuddy etc,
Check my portfolio
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If interested, pls accept my bid. Looking forward to work with you on this project.
Awaiting your favorable response
Thank you
Apeetha