Credit and usage billing in a simple API

POST api.codelet.co/v1/ingest

{
  "customer_id": "cust_abc123",
  "metric": "api_request",
  "quantity": 4820,
  "idempotency_key": "req_7f3a..."
}

POST api.codelet.co/v1/checkout

{
  "plan_id": "plan_pro",
  "customer_email": "buyer@example.com",
  "success_url": "https://app.example.com/welcome"
}

POST api.codelet.co/v1/checkout

{
  "pack_id": "pack_abc",
  "customer_id": "cus_31da..."
}

GET api.codelet.co/v1/customers/cust_abc123/balance?metric=api_request

{
  "balances": [
    {
      "metric": "api_request",
      "included_remaining": "73",
      "purchased_remaining": "412",
      "total_available": "485"
    }
  ]
}

await codelet.ingest({
  customer_id: "cust_abc123",
  metric: "api_request",
  quantity: "4820",
  idempotency_key: "req_7f3a...",
});

const checkout = await codelet.checkout.createCheckout({
  plan_id: "plan_pro",
  customer_email: "buyer@example.com",
  success_url: "https://app.example.com/welcome",
});

const checkout = await codelet.checkout.createCheckout({
  pack_id: "pack_abc",
  customer_id: "cus_31da...",
});

const balances = await codelet.customers.getCustomerBalance(
  "cust_abc123",
  { metric: "api_request" },
);

$codelet->ingest(
    (new IngestEventRequest())
        ->setCustomerId('cust_abc123')
        ->setMetric('api_request')
        ->setQuantity('4820')
        ->setIdempotencyKey('req_7f3a...')
);

$checkout = $codelet->checkout->createCheckout(
    (new CreateCheckoutRequest())
        ->setPlanId('plan_pro')
        ->setCustomerEmail('buyer@example.com')
        ->setSuccessUrl('https://app.example.com/welcome')
);

$checkout = $codelet->checkout->createCheckout(
    (new CreateCheckoutRequest())
        ->setPackId('pack_abc')
        ->setCustomerId('cus_31da...')
);

$balances = $codelet->customers->getCustomerBalance(
    'cust_abc123',
    'api_request'
);

codelet.ingest({
    "customer_id": "cust_abc123",
    "metric": "api_request",
    "quantity": "4820",
    "idempotency_key": "req_7f3a...",
})

checkout = codelet.checkout.create_checkout(
    CreateCheckoutRequest(
        plan_id="plan_pro",
        customer_email="buyer@example.com",
        success_url="https://app.example.com/welcome",
    )
)

checkout = codelet.checkout.create_checkout(
    CreateCheckoutRequest(
        pack_id="pack_abc",
        customer_id="cus_31da...",
    )
)

balances = codelet.customers.get_customer_balance(
    "cust_abc123",
    metric="api_request",
)