NewMongoConfig creates a new MongoDB configuration from environment variables

DefaultConfig returns a Config with sensible default values

GetDatabase returns a database instance

GetRandomAvatar returns a random avatar URL from the randomuser.me API

Note that on multiple instances of the API gateway, the connection manager needs to store the connections on a separate shared storage.

NewMongoClient creates a new MongoDB client

NewPaymentService creates a new instance of the payment service

TracedConsumer wraps the RabbitMQ message handler with tracing

TracedPublisher wraps the RabbitMQ publish function with tracing

WithBackoff executes the given operation with exponential backoff retry logic