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All payment and delivery endpoints require a cartId as the first argument.

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Payment Methods

Payment methods, payments, and fulfillments are included in the cart response — there are no separate list or get endpoints for these resources. 
const options = { spreeToken: cart.token };

// Access payment methods, payments, and fulfillments from the cart response
const cart = await client.carts.get(cartId, options);
const paymentMethods = cart.payment_methods;
const payments = cart.payments;
const fulfillments = cart.fulfillments;

// Each payment method includes a `session_required` flag:
// - true  → use Payment Sessions (Stripe, Adyen, PayPal, etc.)
// - false → use direct payment creation (Check, Cash on Delivery, Bank Transfer, etc.)

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Payments

const options = { spreeToken: cart.token };

// Create a payment for a non-session payment method
// (e.g. Check, Cash on Delivery, Bank Transfer, Purchase Order)
const payment = await client.carts.payments.create(cartId, {
  payment_method_id: 'pm_xxx',
  amount: '99.99',              // Optional, defaults to order total minus store credits
  metadata: {                   // Optional, write-only metadata
    purchase_order_number: 'PO-12345',
  },
}, options);
payments.create() only works with non-session payment methods (where session_required is false). For session-based gateways like Stripe or Adyen, use paymentSessions.create() instead.

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Payment Sessions

Payment sessions provide a unified, provider-agnostic interface for payment processing. They work with any payment gateway (Stripe, Adyen, PayPal, etc.) through a single API. 
const options = { spreeToken: cart.token };

// Create a payment session (initializes a session with the payment gateway)
const session = await client.carts.paymentSessions.create(cartId, {
  payment_method_id: 'pm_xxx',
  amount: '99.99',             // Optional, defaults to order total
  external_data: {              // Optional, provider-specific data
    return_url: 'https://mystore.com/checkout/complete',
  },
}, options);

// The session contains provider-specific data (e.g., Stripe client_secret)
console.log(session.external_data.client_secret);

// Get a payment session
const existing = await client.carts.paymentSessions.get(
  cartId, session.id, options
);

// Update a payment session (e.g., after order total changes)
await client.carts.paymentSessions.update(cartId, session.id, {
  amount: '149.99',
}, options);

// Complete the payment session (after customer confirms payment on the frontend)
const completed = await client.carts.paymentSessions.complete(
  cartId, session.id,
  { session_result: 'success' },
  options
);
console.log(completed.status); // 'completed'

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Fulfillments

const options = { spreeToken: cart.token };

// Fulfillments are included in the cart response
const cart = await client.carts.get(cartId, options);
const fulfillments = cart.fulfillments;

// Select a delivery rate
await client.carts.fulfillments.update(cartId, fulfillmentId, {
  selected_delivery_rate_id: 'rate_xxx',
}, options);