iOS Application login flow

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Hi.
I want to create iOS app. I need to know based auth flow. Which API I can log in Jira?

P.S. I try log in with

https://betconstruct.atlassian.net/jsd-login/v1/authentication/authenticate

parameters {"email" : "****", "password" : "****"} but I get this error

▿ SUCCESS: {
    context =     {
        errorDetail = "SyntaxError: Unexpected token e in JSON at position 0";
    };
    key = "bad-request-format";
}
  ▿ success : 2 elements
    ▿ 0 : 2 elements
      - key : key
      - value : bad-request-format
    ▿ 1 : 2 elements
      - key : context
      ▿ value : 1 element
        ▿ 0 : 2 elements
          - key : errorDetail
          - value : SyntaxError: Unexpected token e in JSON at position 0

Thanks!