const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    expiresIn: 123,
    allowedModels: ['<string>'],
    allowedOrigins: ['<string>'],
    constraints: {realtime: {maxSessionDuration: 123}},
    metadata: {}
  })
};

fetch('https://api.decart.ai/v1/client/tokens', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "apiKey": "<string>",
  "expiresAt": "<string>",
  "permissions": {},
  "constraints": {}
}