> For the complete documentation index, see [llms.txt](https://www.feinfra.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.feinfra.com/technical-functional-requirements/backend-integration.md).

# Backend Integration

## Todo

* Am I designing Backend? Or Just FE? 
* API 
  * Already written? Writing together with BE? Proposing? 
  * Protocols: Sockets? REST? GraphQL? GRPC? Mix of each (REST for one time info, Sockets for Stock Prices) 
* Error Handling 
  * Retry Mechanism? 
  * Messaging to the user 
* Long Async Requests 
  * Ex: Buy operation that may take 1+ minutes, chunked buy (buy shares as they become available) 
  * Push messaging when operation is complete, email, think about this flow Multi Day operations - clearing of funds (prob email) 
* Interaction with BE 
  * Something like OpenAPI/Swagger to sync on documentation/API contract 
  * Generating TypeScript Types from OpenAPI 
  * Are we synching API versions between releases? 
  * Make sure FE is released at same time as corresponding BE Major releases. 
  * Minor releases? Breaking API releases? 
  * How do we make sure nothing breaks as BE changes? 
  * Integration testing strategy
  * Postman


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