curl -X POST "https://api.fitsociety.io/public/v1/finance/clients/{clientId}/memberships" \
  -H "Authorization: Bearer <access_token>" \
  -H "Idempotency-Key: <stable_request_key>" \
  -H "Content-Type: application/json" \
  -d '{}'

const options = {
  method: 'POST',
  headers: {
    'Idempotency-Key': '<idempotency-key>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({membershipProductId: '<string>'})
};

fetch('https://api.fitsociety.io/public/v1/finance/clients/{clientId}/memberships', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.fitsociety.io/public/v1/finance/clients/{clientId}/memberships"

payload = { "membershipProductId": "<string>" }
headers = {
    "Idempotency-Key": "<idempotency-key>",
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)