curl --request POST \
  --url "https://siteadresiniz.example/Files/Controllers/ControllersAll.php?main=Products&container=ProductsAddController" \
  --header "X-API-Key: $ZONELY_API_KEY" \
  --form 'name=ALAN_DEGERI' \
  --form 'init=ALAN_DEGERI' \
  --form 'details=ALAN_DEGERI' \
  --form 'categoryIDs=ALAN_DEGERI' \
  --form 'developerID=ALAN_DEGERI' \
  --form 'contents=ALAN_DEGERI' \
  --form 'price=ALAN_DEGERI' \
  --form 'image=@DOSYA_YOLU' \
  --form 'variantIDs=ALAN_DEGERI' \
  --form 'productQuestions=ALAN_DEGERI' \
  --form 'extraServices=ALAN_DEGERI'

const form = new FormData();
form.append('name', 'Başlangıç Paketi');
form.append('init', 'Baslangic paketi');
form.append('details', 'Dijital ürün açıklaması');
form.append('categoryIDs', '1');
form.append('price', '49.90');
form.append('insertProducts', 'OTURUM_FORMUNUN_CSRF_DEGERI');
form.append('image', '{
  "fileName": "example-file"
}');

const options = {method: 'POST', headers: {'X-API-Key': '<api-key>'}};

options.body = form;

fetch('https://example.com/Files/Controllers/ControllersAll.php', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{}