Order Lifecycle

Orders in Unchained Engine follow a well-defined lifecycle from cart creation through fulfillment. Understanding this lifecycle is essential for implementing checkout flows and integrating with external systems.

Order States

Status	Description
null (OPEN)	Cart - actively being modified
PENDING	Checkout initiated, awaiting payment confirmation
CONFIRMED	Payment confirmed, awaiting delivery
FULFILLED	Delivery complete, order finished
REJECTED	Order cancelled/rejected

Distributed Locking

Locking

Unchained uses "Distributed Locking" during checkout, order confirmation, and order rejection. All of these services trigger the order processor state machine.

State Persistence

Every time the order processor persists an order status in the database (think "auto-save" in games), order status notification messages are triggered asynchronously. If it does not persist, the status is in memory only.

OPEN (Cart)

An order starts its life with a status of null, indicating it's a cart.

Key Characteristics

• User Required: A cart always has a userId. For anonymous users, call loginAsGuest mutation first.
• Created on Demand: Carts only exist when at least one cart mutation has been called. Before that, Query.me.cart returns null.
• Automatic Recalculation: With every cart mutation, prices and delivery dates are recalculated.
• Side-Effect Free Reading: Reading a cart doesn't trigger any calculations or state changes.

Cart Behavior

mutation LoginAsGuest {
  loginAsGuest {
    _id
    tokenExpires
  }
}

mutation AddToCart {
  addCartProduct(productId: "...", quantity: 1) {
    _id
    product { _id }
    quantity
  }
}

See Cart Behavior for customization options.

OPEN → PENDING (Checkout)

Checkout is typically triggered server-to-server from payment plugin webhooks. In error cases, clients may call checkout directly to analyze errors.

Checkout Validation

When checkout is initiated, the order is validated:

1. Payment Provider: Order must have a payment provider set
2. Delivery Provider: Order must have a delivery provider set
3. Cart Items: At least one order position must be present
4. Position Validation: Each position is validated via validateOrderPosition:
   • By default, checks if the product is still active
   • Can be customized via platform settings
5. Quotation Check: If position is a quotation proposal, the Quotation plugin verifies it's still valid

No Recalculation

The order validation step DOES NOT recalculate the order. Prices and delivery dates may have changed since the last cart mutation. If you need such validation, throw an error in validateOrderPosition and let the client application fix the problem.

Transition to PENDING

After validation passes, the order enters PENDING status as an in-flight status (not yet persisted to database).

mutation {
  checkoutCart {
    _id
    status
    orderNumber
  }
}

PENDING → CONFIRMED (Confirmation)

The system proceeds with payment processing via the PaymentDirector.

Payment Processing Flow

Payment Outcomes

charge() Result	Order Status	Behavior
Returns { transactionId }	Continues to confirmation	Payment successful
Returns false	Continues to confirmation	Payment not yet complete
Throws error	Stays OPEN	Checkout aborted

Auto-Confirmation Check

After payment, Unchained checks if auto-confirmation is allowed:

• Payment Plugin: isPayLaterAllowed() method
• Delivery Plugin: isAutoReleaseAllowed() method

Pay Later Example

A post-paid invoice plugin typically returns true for isPayLaterAllowed because delivery can proceed without payment.

A pre-paid invoice plugin typically returns false, blocking order confirmation until payment is received.

If Confirmation Blocked

Checkout ends with order persisted as PENDING, waiting for:

• Payment webhook events
• Manual confirmation via Mutation.confirmOrder

If Confirmation Allowed

1. Payment plugin's confirm() method is called (payment may have been only reserved)
2. Order transitions to CONFIRMED
3. Status is persisted to database

PENDING → REJECTED (Rejection)

An order in PENDING state can be rejected, typically via manual API call.

mutation {
  rejectOrder(orderId: "...") {
    _id
    status
  }
}

Rejection Flow

1. PaymentDirector calls cancel() on the payment adapter
2. If cancel() throws, order stays PENDING
3. Otherwise, order is persisted as REJECTED

CONFIRMED → FULFILLED (Fulfillment)

The system proceeds with delivery via the DeliveryDirector.

Delivery Processing

1. Delivery Initiation: DeliveryDirector calls send() on the delivery adapter

   • If throws: Process interrupted, order stays CONFIRMED
   • If returns false: Delivery not complete yet
   • If returns { trackingNumber }: Delivery initiated

2. Position Processing: For each order position:

   • TokenizedProduct: WarehousingDirector.tokenize() creates digital tokens/NFTs
   • PlanProduct: EnrollmentDirector.transformOrderItemToEnrollment() creates subscriptions
   • Quotation: QuotationDirector marks linked quotations as fulfilled

3. Final Status Check:

   • If delivery is DELIVERED AND payment is PAID → FULFILLED
   • Otherwise → stays CONFIRMED

Avoid Throwing in Plugins

If any position processing throws (e.g., in a WarehousingAdapter), the process is interrupted in an unsupported state. Resolving this requires custom code and deep knowledge of internals.

Best Practice: Build these actions to be asynchronous and forgiving:

async send() {
  // Queue work instead of blocking
  await context.modules.worker.addWork({
    type: 'EXTERNAL_ERP_SYNC',
    input: { orderId: order._id },
  });
  return false; // Not complete yet - will be updated by worker
}

This approach also makes checkouts faster!

Order Processor State Machine

// Simplified state machine logic
async function processOrder(order) {
  if (order.status === null) {
    // Cart - ready for checkout
    return await checkout(order);
  }

  if (order.status === 'PENDING') {
    // Awaiting payment confirmation
    // Can transition to CONFIRMED or REJECTED
  }

  if (order.status === 'CONFIRMED') {
    // Awaiting delivery
    // Can transition to FULFILLED
  }
}

Event Notifications

Order status changes trigger asynchronous notifications:

Event	When Triggered
ORDER_CHECKOUT	Order moves from OPEN to PENDING
ORDER_CONFIRMED	Order confirmed
ORDER_REJECTED	Order rejected
ORDER_FULFILLED	Order fulfilled
ORDER_PAYMENT_STATUS_CHANGED	Payment status changes
ORDER_DELIVERY_STATUS_CHANGED	Delivery status changes

Subscribe to these events for:

• Sending customer notifications
• Syncing with external systems (ERP, CRM)
• Analytics and reporting

Sub-Statuses

Orders have separate statuses for payment and delivery:

Payment Status

Status	Description
OPEN	No payment action taken
PAID	Payment received
REFUNDED	Payment refunded

Delivery Status

Status	Description
OPEN	No delivery action taken
DELIVERED	Delivery complete
RETURNED	Items returned

GraphQL Queries

query GetOrder {
  order(orderId: "...") {
    _id
    status
    orderNumber
    payment {
      status
    }
    delivery {
      status
    }
    items {
      _id
      quantity
      total {
        amount
        currencyCode
      }
    }
    total {
      amount
      currencyCode
    }
  }
}

Related

• Orders Module - Order configuration
• Payment Plugins - Payment adapters
• Delivery Plugins - Delivery adapters
• Pricing System - Pricing chain