Create payment session

import { createClient } from '@spree/sdk'

const client = createClient({
  baseUrl: 'https://your-store.com',
  publishableKey: '<api-key>',
})

const session = await client.carts.paymentSessions.create('cart_abc123', {
  payment_method_id: 'pm_abc123',
}, {
  bearerToken: '<token>',
})

{
  "id": "ps_gbHJdmfrXB",
  "status": "pending",
  "currency": "USD",
  "external_id": "bogus_132b1569948ecfadcdbe8874",
  "external_data": {
    "client_secret": "bogus_secret_d6b143775506dc90"
  },
  "customer_external_id": null,
  "expires_at": null,
  "created_at": "2026-03-28T11:44:45.965Z",
  "updated_at": "2026-03-28T11:44:45.965Z",
  "amount": "110.0",
  "payment_method_id": "pm_UkLWZg9DAJ",
  "order_id": "or_UkLWZg9DAJ",
  "payment_method": {
    "id": "pm_UkLWZg9DAJ",
    "name": "Credit Card",
    "description": null,
    "type": "Spree::Gateway::Bogus",
    "session_required": true
  }
}