Afterpay to Odoo Integration: Complete 2025 Guide

Integration Architecture and Data Flow

System Components and Their Roles

The Afterpay-Odoo integration relies on four core components working in concert. Your Odoo 18 instance acts as the system of record, managing orders, inventory, and accounting. The Afterpay payment gateway processes consumer transactions and manages installment plans. A custom Odoo module, which you will build, serves as the integration engine, containing the models and controllers that handle API communication. A reverse proxy like Nginx manages SSL termination and request routing for webhook endpoints that Afterpay calls for event notifications.

This architecture employs a hybrid synchronization pattern. Odoo initiates outbound API calls to Afterpay for specific actions like payment captures and refunds. Afterpay uses webhooks for inbound notifications about payment events. Your custom module implements both directions, ensuring data consistency without continuous polling. The design prioritizes Odoo as the authoritative data source for order information while treating Afterpay as the payment authority.

Data Flow for Payment Processing

A complete transaction flows through six distinct stages. When a customer selects Afterpay at checkout on your ecommerce platform, your system creates an Odoo sale order in a confirmed state but with a pending payment status. Your frontend calls Afterpay’s /checkouts endpoint to initialize a payment session, receiving a token for the transaction. After the customer completes authentication with Afterpay, your system receives a confirmation and updates the Odoo order.

Your custom module then executes a payment capture by calling Afterpay’s /payments/capture endpoint with the order details and amount. This API call moves funds from the customer’s Afterpay account to your merchant account. Upon successful capture, Afterpay sends a webhook notification to your Odoo instance, triggering an automatic payment reconciliation that links the transaction to the original sale order in Odoo’s accounting module.

Webhook Implementation Strategy

Afterpay requires a secure endpoint for sending payment event notifications. Your custom Odoo module exposes a controller at /afterpay/webhook/notification that accepts POST requests. This endpoint validates the webhook signature using Afterpay’s public key to ensure request authenticity. The controller processes events like ‘payment.capture_completed’ and ‘payment.refund_settled’, updating the corresponding Odoo records.

The webhook handler employs a queue processing mechanism to handle multiple notifications without blocking. It logs all incoming requests to a dedicated integration log model for audit purposes. For each valid webhook, the system spawns a new Odoo job that processes the event asynchronously, preventing timeout issues and ensuring reliable processing even during peak loads.

Step-by-Step Configuration

Afterpay Merchant Account Setup

Begin with your Afterpay merchant configuration. Log into your Afterpay merchant portal and navigate to the Developer Settings section. Generate a new set of API credentials, distinguishing between sandbox and production keys. Afterpay provides separate endpoints for testing and live operations, so record both the sandbox API base URL (https://api-sandbox.afterpay.com) and production URL (https://api.afterpay.com).

Configure your webhook URLs in the Afterpay portal. Set the notification endpoint to https://your-odoo-domain.com/afterpay/webhook/notification. Afterpay requires webhook verification, so you must implement a challenge-response endpoint at /afterpay/webhook/verification that returns the challenge parameter when Afterpay performs initial setup. Specify the events you want to receive, including ‘payment.capture_completed’, ‘payment.refund_settled’, and ‘payment.auth_voided’.

Set your merchant reference format in Afterpay’s portal to match your Odoo order naming convention. This reference serves as the critical link between systems, so ensure it uses a predictable pattern like ‘SO-{sequence_number}’. Configure your settlement currency and payment capture method, choosing between automatic capture upon order confirmation or manual capture that you trigger from Odoo. This decision affects your integration logic.

Odoo Module Structure and Dependencies

Create a new Odoo module named ‘payment_afterpay’ with the standard Odoo module structure. Define your module dependencies in the manifest.py file, requiring ‘sale’, ‘payment’, ‘account’, and ‘website_sale’. Your module will extend these core Odoo applications to integrate Afterpay functionality. Create the basic directory structure with models, controllers, views, and security directories.

Implement the payment.acquirer model extension to register Afterpay as a payment method in Odoo’s ecommerce flow. Override the _compute_feature_support_fields method to indicate Afterpay supports refund operations. Extend the payment.provider model in Odoo 18 to add Afterpay-specific configuration fields like API keys, webhook secret, and environment selection (sandbox/production).

from odoo import models, fields

class PaymentProvider(models.Model):
    _inherit = 'payment.provider'

    code = fields.Selection(
        selection_add=[('afterpay', 'Afterpay')],
        ondelete={'afterpay': 'set default'}
    )
    afterpay_merchant_id = fields.Char(string='Merchant ID')
    afterpay_secret_key = fields.Char(string='Secret Key')
    afterpay_public_key = fields.Char(string='Public Key')
    afterpay_environment = fields.Selection(
        selection=[('sandbox', 'Sandbox'), ('production', 'Production')],
        default='sandbox'
    )

Authentication Handler Implementation

Build a dedicated authentication class that manages API tokens and request signing. Afterpay uses HMAC authentication for API requests, requiring you to generate a signature for each API call. Create a Python class that constructs the Authorization header using your merchant ID and secret key.

import hashlib
import hmac
import base64
from datetime import datetime

class AfterpayAuth:
    def __init__(self, merchant_id, secret_key):
        self.merchant_id = merchant_id
        self.secret_key = secret_key

    def generate_auth_headers(self, method, path, body=''):
        timestamp = datetime.utcnow().strftime('%a, %d %b %Y %H:%M:%S GMT')
        message = f"{method}\n{path}\n{timestamp}\n"
        if body:
            message += body
        signature = base64.b64encode(
            hmac.new(
                self.secret_key.encode('utf-8'),
                message.encode('utf-8'),
                hashlib.sha256
            ).digest()
        ).decode('utf-8')
        return {
            'Authorization': f'Basic {self.merchant_id}:{signature}',
            'Content-Type': 'application/json',
            'Accept': 'application/json',
            'Date': timestamp
        }

Payment Capture Controller

Implement the payment capture logic that triggers when orders confirm in Odoo. Override the _create_transaction method in your payment.provider model to intercept Afterpay payments. This method should call Afterpay’s /payments/capture endpoint with the order details and amount.

def afterpay_capture_payment(self, order_reference, amount, currency, afterpay_token):
    api_url = self._get_afterpay_api_url()
    capture_endpoint = f"{api_url}/v2/payments/capture"
    
    auth = AfterpayAuth(self.afterpay_merchant_id, self.afterpay_secret_key)
    headers = auth.generate_auth_headers('POST', '/v2/payments/capture')
    
    capture_data = {
        'token': afterpay_token,
        'merchantReference': order_reference,
        'amount': {
            'amount': str(amount),
            'currency': currency
        }
    }
    
    response = requests.post(capture_endpoint, json=capture_data, headers=headers)
    if response.status_code == 201:
        return response.json()['id']
    else:
        raise ValueError(f"Afterpay capture failed: {response.text}")

Webhook Controller Implementation

Create a webhook controller that handles incoming Afterpay notifications. This controller validates the webhook signature, processes the event, and updates the corresponding Odoo transaction record.

from odoo import http
import json
import hashlib
import hmac

class AfterpayWebhook(http.Controller):
    
    @http.route('/afterpay/webhook/notification', type='json', auth='public', methods=['POST'], csrf=False)
    def webhook_notification(self):
        data = json.loads(request.httprequest.data)
        webhook_signature = request.httprequest.headers.get('X-Afterpay-Signature')
        
        # Validate webhook signature
        expected_signature = hmac.new(
            config['webhook_secret'].encode('utf-8'),
            request.httprequest.data,
            hashlib.sha256
        ).hexdigest()
        
        if not hmac.compare_digest(webhook_signature, expected_signature):
            raise ValueError("Invalid webhook signature")
        
        # Process webhook event
        event_type = data['eventType']
        payment_id = data['paymentId']
        
        if event_type == 'payment.capture_completed':
            self._process_payment_capture(data)
        elif event_type == 'payment.refund_settled':
            self._process_refund_settled(data)
            
        return {'status': 'processed'}

Odoo Payment Method Configuration

Configure the Afterpay payment method in Odoo’s backend. Navigate to Website → Configuration → Payment Providers in Odoo 18. Click “Create” and select “Afterpay” from the provider dropdown. Enter the API credentials you obtained from the Afterpay merchant portal. Set the payment method name that customers will see at checkout, such as “Pay with Afterpay”.

Configure the payment method restrictions based on your business rules. Set country availability if Afterpay only operates in specific regions. Configure minimum and maximum order amounts that align with Afterpay’s policies. Enable the payment method for your ecommerce website and test the checkout process in sandbox mode before activating production.

Set the webhook URL in your Odoo configuration, ensuring it matches the endpoint you registered in the Afterpay portal. Odoo requires specific CSRF configuration for public controllers that receive webhook calls, so add the route to the CSRF exclusion list in your Odoo configuration file. Test that the webhook endpoint responds correctly to verification requests from Afterpay.

Data Mapping and Transformation

Order Data Structure Alignment

Afterpay and Odoo employ different data models for order information, requiring precise field mapping. Your integration must transform Odoo sale order data into Afterpay’s checkout schema. Map Odoo’s order name field to Afterpay’s merchantReference, which serves as the primary cross-reference identifier. Transform Odoo’s partner shipping address into Afterpay’s consumer structure, handling country codes, phone numbers, and address line concatenation.

Odoo’s product line items require conversion to Afterpay’s line items array. Extract the product name, SKU, quantity, and price from Odoo’s sale.order.line records. Calculate the total order value, ensuring it matches the sum of line items plus shipping and tax amounts. Afterpay validates this amount during payment capture, so discrepancies cause transaction failures.

def map_order_to_afterpay_checkout(self, order):
    line_items = []
    for line in order.order_line:
        if line.product_id:
            line_items.append({
                'name': line.product_id.name,
                'sku': line.product_id.default_code or '',
                'quantity': int(line.product_uom_qty),
                'price': {
                    'amount': str(line.price_unit),
                    'currency': order.currency_id.name
                }
            })
    
    checkout_data = {
        'amount': {
            'amount': str(order.amount_total),
            'currency': order.currency_id.name
        },
        'merchantReference': order.name,
        'consumer': self._map_partner_to_consumer(order.partner_id),
        'billing': self._map_partner_to_address(order.partner_id),
        'shipping': self._map_partner_to_address(order.partner_shipping_id),
        'items': line_items,
        'discounts': self._map_discounts(order),
        'shippingAmount': {
            'amount': str(order.amount_delivery),
            'currency': order.currency_id.name
        }
    }
    return checkout_data

Payment Transaction Synchronization

Afterpay payment events must create corresponding account.payment records in Odoo. Map Afterpay’s payment ID to Odoo’s payment transaction reference field. Transform Afterpay’s payment status to Odoo’s payment state, converting ‘APPROVED’ to ‘done’, ‘DECLINED’ to ‘cancel’, and ‘PENDING’ to ‘pending’. Store the Afterpay transaction timestamp as the payment date in Odoo.

Handle installment payment specifics by capturing the payment plan details from Afterpay’s response. Store the number of installments, installment amounts, and payment schedule in a custom field on the account.payment record. This data enables accurate accounting treatment and customer communication about payment schedules.

Refund Data Mapping

Refund operations require careful mapping between Odoo’s account.move refund records and Afterpay’s refund API. Extract the refund reason from Odoo’s reversal reason field and map it to Afterpay’s refund justification. Transform the refund amount and currency, ensuring partial refunds calculate correctly against the original transaction.

Map Odoo’s refund line items to Afterpay’s refund items array, maintaining consistency with the original order line items. Preserve the product SKU and quantity to ensure Afterpay’s system matches the refund to the correct original items. Store Afterpay’s refund ID in Odoo’s account.move record for reconciliation and audit purposes.

Webhook Event to Odoo State Transitions

Afterpay webhook events trigger state changes in Odoo’s payment and order records. Map ‘payment.capture_completed’ events to confirm the sale order and mark the payment as reconciled. Transform ‘payment.refund_settled’ events to update the account.move refund state to ‘posted’. Handle ‘payment.auth_voided’ events by canceling the pending payment transaction in Odoo.

Create a dedicated mapping table that defines the relationship between Afterpay event types and Odoo workflow actions. This approach centralizes the business logic and simplifies maintenance. Log each transformation in an integration log model for debugging and audit purposes, capturing the source data from Afterpay and the resulting actions in Odoo.

Error Handling and Resilience

API Communication Failures

Afterpay API calls encounter several common failure modes that your integration must handle. Network timeouts occur when Afterpay’s endpoint responds slowly or not at all. Implement retry logic with exponential backoff for transient failures. Use a circuit breaker pattern that stops calling Afterpay’s API after consecutive failures, preventing system overload during Afterpay outages.

Authentication errors happen when API keys expire or become invalid. Monitor for 401 responses and alert administrators to update credentials. Token expiration requires reauthentication flows that regenerate API tokens without manual intervention. Store credential expiration dates and proactively refresh tokens before they expire.

Rate limiting responses (429 status code) demand careful handling. Afterpay imposes API rate limits that vary by plan. Implement request queuing that respects these limits, spacing API calls to stay within your allocated quota. Track your API usage against known limits and trigger alerts when approaching thresholds.

Data Validation and Transformation Errors

Payment amount mismatches between Odoo and Afterpay cause capture failures. Validate order totals before initiating payment capture, recalculating amounts if discrepancies exist. Implement a reconciliation process that identifies mismatched amounts and either corrects the Odoo order or creates an adjustment transaction.

Address validation errors occur when shipping addresses don’t meet Afterpay’s requirements. Pre-validate addresses using Afterpay’s /addresses/validation endpoint before creating checkouts. Transform Odoo address fields to match Afterpay’s expected format, handling edge cases like apartment numbers, special characters, and region codes.

Webhook signature verification failures indicate potential security issues. Log these events with full request details for security analysis. Implement a temporary blocklist for IP addresses that repeatedly send invalid signatures, protecting against brute force attacks. Notify administrators of signature failures for immediate investigation.

Order of Operations Failures

Race conditions happen when webhook notifications arrive before Odoo initiates the corresponding action. Implement idempotent processing that handles duplicate events gracefully. Use unique transaction identifiers to detect and skip already-processed events. Maintain event processing state to ensure operations complete in the correct sequence.

Partial failures during multi-step operations require compensation transactions. If payment capture succeeds but Odoo record update fails, implement a cleanup process that voids the Afterpay payment or retries the Odoo update. Use database transactions to maintain consistency between Odoo records and Afterpay operations.

Debugging and Logging Strategy

Create a comprehensive logging system that captures every API call and webhook event. Store request and response payloads, headers, timestamps, and processing outcomes. Implement log retention policies that balance debugging needs with storage constraints. Create log views in Odoo that let administrators monitor integration health.

Build diagnostic tools that test connectivity to Afterpay’s API, verify webhook configuration, and validate data mappings. Expose these tools in Odoo’s settings menu for easy access. Implement alerting that notifies administrators of persistent errors or integration degradation. Create automated recovery procedures for common failure scenarios.

Testing and Validation

Sandbox Environment Configuration

Establish a dedicated Odoo sandbox instance that mirrors your production configuration. Configure Afterpay’s sandbox environment with test merchant credentials that simulate production behavior. Use Afterpay’s test card numbers and customer profiles to validate different payment scenarios without moving real money.

Create test data that covers your product catalog, customer segments, and order patterns. Develop representative test orders with various product combinations, shipping methods, and customer locations. Include edge cases like international orders, high-value transactions, and partial fulfillments that test your integration’s robustness.

Payment Flow Test Scenarios

Test the complete payment journey from checkout to settlement. Simulate customer interactions with Afterpay’s checkout widget, including successful payments, declined transactions, and abandoned flows. Verify that Odoo order status updates correctly for each scenario and that payment records create with proper reconciliation.

Validate installment payment handling by testing different payment plans. Confirm that Odoo captures the correct installment amounts and schedules. Test partial payments and verify that accounting records reflect the payment structure accurately. Ensure customer communications mention the installment nature of the transaction.

Webhook Testing Methodology

Test webhook delivery and processing using Afterpay’s webhook simulator or direct API calls. Send test events for all supported event types and verify Odoo processes them correctly. Simulate webhook failures by sending malformed data or invalid signatures and confirm your error handling works as expected.

Validate webhook idempotency by sending duplicate events and verifying they don’t create duplicate records. Test event ordering by sending events out of sequence and confirming your integration handles them correctly. Verify that webhook processing maintains data consistency even when Odoo experiences high load.

Data Synchronization Validation

Create validation scripts that compare data between Odoo and Afterpay. Check order totals, customer information, and payment status across both systems. Identify discrepancies and trace them to their root causes. Automate these checks to run periodically and alert on data drift.

Test reconciliation accuracy by matching Odoo accounting entries with Afterpay settlement reports. Verify that payment amounts, fees, and timestamps align between systems. Test refund reconciliation to ensure Odoo account.move records match Afterpay refund transactions. Validate that financial reports reflect the correct revenue recognition.

Performance and Load Testing

Measure integration performance under realistic load conditions. Simulate peak sales periods with high transaction volumes and verify the system maintains responsiveness. Test API rate limit handling by generating requests that approach your allocated quotas. Monitor Odoo resource usage during synchronization processes.

Establish performance benchmarks for key operations: payment capture time, webhook processing latency, and data synchronization duration. Set alert thresholds that trigger when performance degrades beyond acceptable levels. Test system recovery after temporary outages by simulating network partitions and service disruptions.

Security Considerations

API Credential Management

Store Afterpay API credentials in Odoo’s configuration parameters with proper encryption. Never hardcode credentials in module code or version control. Implement credential rotation procedures that update keys without service interruption. Use Odoo’s secret storage system or external secret management services for production deployments.

Secure credential transmission by enforcing HTTPS for all API communications. Validate SSL certificates when connecting to Afterpay’s endpoints to prevent man-in-the-middle attacks. Implement certificate pinning if your security policy requires additional assurance about endpoint identity.

Webhook Security Implementation

Validate every webhook request using Afterpay’s signature verification mechanism. Compute the expected signature using your webhook secret and compare it with the incoming signature header. Reject requests that fail verification with a generic error message that doesn’t leak implementation details.

Implement replay attack protection by checking webhook timestamps and rejecting requests that are too old. Maintain a short-lived cache of processed webhook IDs to prevent duplicate processing. Limit webhook processing time to prevent resource exhaustion attacks from malicious payloads.

Data Protection and Privacy

Encrypt sensitive customer data stored in Odoo, including payment tokens and personal information. Anonymize data in non-production environments to protect customer privacy. Implement access controls that restrict integration data to authorized personnel only.

Comply with privacy regulations by implementing data retention policies that automatically purge sensitive data after business needs expire. Create data export and deletion procedures that handle Afterpay integration data. Document data flows between systems for compliance reporting.

Authentication and Authorization

Implement principle of least privilege for integration functions. Create dedicated Odoo user accounts with minimal permissions for integration processes. Restrict access to integration configuration screens to authorized administrators only.

Audit integration access regularly, reviewing logs for suspicious activities. Monitor for unusual patterns like unexpected API call volumes or webhook sources. Implement automatic blocking of suspicious IP addresses and alert security teams to potential breaches.

Performance Optimization

API Call Optimization

Batch API requests to reduce round trips to Afterpay’s servers. Group payment capture requests for multiple orders into fewer API calls where possible. Implement request deduplication that identifies identical pending requests and processes them once. Cache frequently accessed Afterpay data like product information or customer details.

Optimize API payload size by sending only necessary fields in requests. Remove redundant data and compress large payloads before transmission. Use field filtering in API calls to retrieve only the data your integration needs. Implement conditional requests using ETag headers where Afterpay supports them.

Database Optimization for Integration Data

Index integration tables on frequently queried fields like merchant references, payment IDs, and timestamps. Partition large log tables by date to improve query performance and simplify archive processes. Implement database connection pooling to handle concurrent webhook processing efficiently.

Optimize Odoo ORM queries in integration code by selecting only needed fields and using prefetch patterns wisely. Avoid N+1 query problems by batching related record lookups. Use read-only database replicas for reporting queries that analyze integration performance.

Asynchronous Processing Implementation

Process webhook notifications asynchronously using Odoo’s queue job system. Immediate response to Afterpay’s webhook calls with acceptance, then process the event in background jobs. This approach prevents webhook timeouts and ensures reliable processing during peak loads.

Implement priority queues that process time-sensitive operations like payment captures before less critical tasks like sync operations. Use multiple queue workers scaled to your transaction volume. Monitor queue lengths and automatically scale workers during high load periods.

Caching Strategies

Cache Afterpay API responses that contain relatively static data like fee structures or country availability. Implement cache invalidation policies that refresh data when it changes. Use distributed caching for multi-worker Odoo deployments to maintain cache consistency.

Cache transformed data between Odoo and Afterpay formats to avoid repeated transformation overhead. Precompute frequently accessed data like customer purchase history or product performance metrics. Implement cache warming procedures that preload critical data during off-peak hours.