Local decisions provide a quick response. Server decisions combine account details, history and transaction context. A sound design uses the different capabilities of both.
Evaluation approach
The device may be able to close a sensitive screen. The backend must enforce decisions that create lasting consequences, such as moving money.
Application example
When the application detects a risky environment, it adds verifiable context to the transaction request. The server does not rely solely on a safe or unsafe label supplied by the client.
Limits and considerations
Define offline restrictions in advance. Automatically treating a lost connection as an attack can affect legitimate users.
Two sides of enforcement
A local response can quickly change the user experience by closing a sensitive screen or preventing a new operation from starting. The server must enforce the remote financial outcome. A client-supplied allow or deny field cannot be the final authority.
When the server rejects an operation, the client also needs to show an understandable state. Disabling a button alone can create accessibility and support problems. Design the decision code, transaction status and safe retry path together so technical investigation and user communication remain consistent.
Checks and decisions
- Define offline coverage
- Bind the signal to the request
- Measure waiting time
Sources
The primary references above provide the technical basis. Example workflows and evaluation suggestions are this publication’s explanations, not independent test results for a particular product.