API BaaS uses RabbitMQ to provide webhook functionality. All user notifications are stored in queues that follow format N.USER_ID. You can get USER_ID from decoded access token, property sub. Notifications that didn't receive ACK are deleted after 4 days. Idle queues are deleted after 7 day period.

If you are not familiar with AMQP first thing you should do is download AMQP client that suits your system and try to reproduce following steps:

1. Pick existing access token or gather one through endpoint https://api-test.lpb.lv/oauth2/token;
2. Establish connection with RabbitMQ using plain connection pattern amqps://:ACCESS_TOKEN@api-test.lpb.lv:5671;
3. Create communication channel with RabbitMQ;
4. Create queue with assertQueue command; Queue name should match pattern N.USER_ID and durable property set true;
5. Set up notification consumption procedure consume;

JavaScript example

var amqp = require( 'amqplib/callback_api' );

var conn = ( error0, connection ) => {
  if ( error0 ) {
    throw error0;
  }
  connection.createChannel( ( error1, channel ) => {
    if ( error1 ) {
      throw error1
    }
    channel.assertQueue( 'N.49acf39b-0ff4-4c01-8dc9-d86f9d85b9d9', { durable: true } );
    channel.consume( 'N.49acf39b-0ff4-4c01-8dc9-d86f9d85b9d9', message => {
      console.log( message.content.toString() );
    }, { noAck: true } );
  } );
}

try {
  amqp.connect( 'amqps://:eyJhbGciOiJSUzI1NiIsInR5cCIgOiAiSldUIiwia2lkIiA6ICJXTDVNdElqYk1aTUhDRzJrcmZjd3V1NEdmN2t2bFJEbGxkNGhPdVBteHljIn0.eyJleHAiOjE2NzM2MTUxODksImlhdCI6MTY3MzYxMzk4OSwianRpIjoiMmQ4ZTBlMGYtNmFmZi00ZmQyLWFlNTctMzE3YTdkNGQzOGVhIiwiaXNzIjoiaHR0cHM6Ly9hcGkubHBiLmx2L2F1dGgvcmVhbG1zL09FT0F1dGgiLCJhdWQiOiJvZWFibEFwcCIsInN1YiI6IjQ5YWNmMzliLTBmZjQtNGMwMS04ZGM5LWQ4NmY5ZDg1YjlkOSIsInR5cCI6IkJlYXJlciIsImF6cCI6ImxwYiIsInNlc3Npb25fc3RhdGUiOiIzMjVlZjA1ZC04N2RmLTQ0NzItYWRkMS1lYzIzMWU5YzZjMWEiLCJhY3IiOiIxIiwic2NvcGUiOiJQU0NVc2VyIiwiY2xpZW50X2lkIjoibHBiIn0.LiFjgMV5iez-vPJoS-JFVWrenqWie09L3Ki2rBwCK8PmrgsJb055HYbuLUXyT03CYxC98gnoQwJSohwoY3f2vZK8LRLxRjMfXsrdwSYGzbLC56gwSi8nMM8rF4w0iBJ9XAHZyKnWDNW_wrCDk0_LqEE0Mswf-rPXpYWHHhCxkX4SBjPYYSOb7YmKNg6mVBrJsdyTbiMnrZqrs0nXP4i3aGCQnPvZDSv2fBt7_KPzEAR1h9AyNf6cDxMG0DKcpv9HJEKOKUFDSw7F5UgNEuAzpc_ROupK-KUruHVHcdbYFYZWo9rQMRu7eT7ClCfzUn7zCftA_YWL7vWzP9C3IyeY0A@api-test.lpb.lv:5671', conn );
}
catch( error ) {
  console.log( error );
}

Webhook notification structure

Webhook notification is stored in JSON format. It has strict structure:

{
  "category": "",
  "timestamp": null,
  "notification": {
    "title": "",
    "body": ""
  },
  "data": {}
}

Webhook notification types