Create Onboarding

curl -X POST 'http://localhost:9000/vendor/payout-accounts/pacc_01HXYZ/onboarding' \
  -H 'Authorization: Bearer <token>' \
  -H 'x-seller-id: <seller_id>' \
  -H 'Content-Type: application/json' \
  -d '{"context": {"refresh_url": "https://vendor.example.com/payouts", "return_url": "https://vendor.example.com/payouts"}}'

const { onboarding } = await client.vendor.payoutAccounts.$id.onboarding.mutate({
  $id: "pacc_01HXYZ",
  context: {
    refresh_url: "https://vendor.example.com/payouts",
    return_url: "https://vendor.example.com/payouts",
  },
})

{
  "onboarding": {
    "id": "onb_01HXYZ",
    "data": { "url": "https://connect.stripe.com/setup/s/..." },
    "context": { "return_url": "https://vendor.example.com/payouts" },
    "created_at": "2026-01-15T10:00:00.000Z"
  }
}