How to auth with only email as identifier?

Questions and Answers Strapi Backend
1
System Information
  • Strapi Version: 4.15.4
  • Operating System: Windows 11
  • Database: sqlite
  • Node Version: 20.9.0
  • NPM Version: 10.1.0

Basicly

Currenctly, with the basic configutation and the Documentation plugin, the required body values are identifier, that could be the user email or the user username, and password.

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Needs

  1. Replace the identifier required body value by email

I want to get an access to the API only with email and password and not with the username anymore

  1. Make the username not unique

I want to keep a required username but not unique anymore, I want it to be more like a pseudo.

Other things

Thanks for help by advance and do not esitate to contact me.