curl --request POST \
  --url https://api.sitespy.app/api/v1/billing/checkout \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "plan": "starter",
  "billing_period": "monthly",
  "success_url": "https://sitespy.app/dashboard/billing?checkout=success"
}
'

import requests

url = "https://api.sitespy.app/api/v1/billing/checkout"

payload = {
    "plan": "starter",
    "billing_period": "monthly",
    "success_url": "https://sitespy.app/dashboard/billing?checkout=success"
}
headers = {
    "x-api-key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    plan: 'starter',
    billing_period: 'monthly',
    success_url: 'https://sitespy.app/dashboard/billing?checkout=success'
  })
};

fetch('https://api.sitespy.app/api/v1/billing/checkout', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "checkout_url": "https://checkout.lemonsqueezy.com/..."
}