import requests

url = "https://api.pdfshift.io/v3/templates/{slug}"

payload = { "content": "<string>" }
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.put(url, json=payload, headers=headers)

print(response.text)

{
  "success": true,
  "template": {
    "slug": "test-1",
    "created": 1734076868000,
    "name": "First test for templates"
  }
}