graph TD subgraph OP E[Openpaas frontend] --> |1.PUT| A end A[Openpaas backend] -->|2.PUT| B subgraph Sabre B[Sabre] --> |3.Auth| A subgraph Plugin G[EventRealTime] H[IMIPPlugin] end end A --> |4.Auth response|B B .->|5. Create RabbitMQ Message |G B .->|5. Create Mail Message |H H -->|7' Trigger the mail | A subgraph Mongo B --> |6.Write| C(mongoDB) end subgraph RabbitMQ G --> |7.Publish| D(RabbitMQ) end D-->|7.Publish|A A.-> |8.Publish|E