Solution: idempotency token
https://www.youtube.com/watch?v=IP-rGJKSZ3s
https://zongwb.medium.com/idempotency-a-three-step-approach-d607895c2b93
Byzantine Fault Tolerance
https://www.youtube.com/watch?v=VWG9xcwjxUg
https://www.youtube.com/watch?v=_e4wNoTV3Gw
![[Untitled 170.png|https://www.youtube.com/watch?v=LoGx_ldRBU0]]