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Google Recaptcha missing-input-secret

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Was trying to make Google Recaptcha work but kept getting failed attempts and the error missing-input-secret back.

After checking 100 times that my secret key was correct, I realized they want URL parameters in the POST request to validate the captcha value.

I was sending the values in the body:

const response = await fetch('', {
  method: "POST",
  headers: {
    'Content-Type': 'application/json',
  body: JSON.stringify({

Instead, this worked:

const response = await fetch('' 
	+ new URLSearchParams({
  }), {
  method: "POST",
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