Event Notification SDK

With notifications, business moments are communicated to all interested listeners a.k.a. subscribers of those event streams. eBay's most recent notification payloads are also secured using ECC signature headers.

Event Notification DotNet SDK is designed to simplify processing eBay notifications. The application receives subscribed messages, validates the integrity of the message using the X-EBAY-SIGNATURE header and delegates to a custom configurable MessageProcessor for plugging in usecase specific processing logic.

Table of contents

• What Notifications are covered?
• Features
• Usage
• Logging
• License

Notifications

This SDK is intended for the latest eBay notifications that use ECC signatures and JSON payloads. While this SDK is generic for any topics, it currently includes the schema definition for MARKETPLACE_ACCOUNT_DELETION notifications.

This SDK now also incorporates support for endpoint validation.

Features

This SDK is intended to bootstrap subscriptions to eBay Notifications and provides a ready DotNet example.

This SDK also incorporates support for endpoint validation.

This SDK incorporates

• A deployable example Dot Net Core application that is generic across topics and can process incoming https notifications
• Allows registration of custom Message Processors.
• Verify the integrity of the incoming messages
  • Use key id from the decoded signature header to fetch public key required by the verification algorithm. An LRU cache is used to prevent refetches for same 'key'.
  • On verification success, delegate processing to the registered custom message processor and respond with a 204 HTTP status code.
  • On verification failure, respond back with a 412 HTTP status code For more details on endpoint validation please refer to the documentation.

    Usage

Prerequisites

.NET Core 3.1

Configure

Update appsettings.json with:

• Path to client credentials (required to fetch Public Key from /commerce/notification/v1/public_key/{public_key_id}).
  Sample Client Credentials Configuration: ebay-config.yaml.

• Environment (PRODUCTION or SANDBOX). Default: PRODUCTION

• Verification token associated with your endpoint. A random sample is included for your endpoint. It is recommended that this verification token be stored in a secure location and this needs to be the same as that provided to eBay.

• Endpoint specific to this deployment. A random url is included as an example.

For MARKETPLACE_ACCOUNT_DELETION use case simply implement custom logic in AccountDeletionMessageProcessor.processInternal()

Install and Run

dotnet build
dotnet run

Onboard any new topic in 3 simple steps! :

• Create new topic model in Models
• Add a custom MessageProcessor for new topic that extends BaseMessageProcessor abstract class and implement 'processInternal(object data)'
• Register the new MessageProcessor in MessageProcessorFactory.getProcessor()

Note on Production deploys

For production, please host with HTTPS enabled.

Logging

Uses standard logging.

License

Copyright 2021 eBay Inc.
Developer: Bhuvana Chandra Meka

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.