Custom Field code

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2

Your code is missing the coins property on the contactInfo object.
It should be like this:

import wixUsers from 'wix-users'

$w.onReady(function () {
  $w('#button1').onClick(function () {
    let email = $w('#input1').value
    let password = $w('#input2').value
    let coins = Number($w('#input3').value)

    wixUsers.register(email, password, {
        contactInfo: {
          coins,
        },
      },
    })
  })
})

But I recommend that you migrate to the new Members API because the Users API is deprecated.

It will be something like this:

1432×1348 108 KB

import { authentication } from 'wix-members'

$w.onReady(() => {
  $w('#button1').onClick(async () => {
    let email = $w('#input1').value
    let password = $w('#input2').value
    let coins = Number($w('#input3').value)
    //Create Options Object with contact info and custom fields
    let options = {
      contactInfo: {
        coins,
      },
    }

    try {
      const registrationResult = await authentication.register(
        email,
        password,
        options
      )
      console.log(registrationResult)
    } catch (error) {
      console.error(error)
    }
  })
})