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Specialized code snippets that "exit" the standard state flow to perform custom logic, such as integrating with external web services or third-party hardware.
| Pitfall | Fix | |--------|-----| | Assuming NDC is synchronous | NDC can send async status updates. Implement a listener thread. | | Hardcoding dispense denominations | Read denom config from APTRA’s settings service. | | Ignoring journal receipts | Always print a minimal journal record; auditors require it. | | No fallback for NDC timeout | Set a 5-second timeout, then reinitialize the NDC session. | aptra advance ndc developer-s guide
APTRA Advance uses XML-based or JSON-defined screen flows. You define: Specialized code snippets that "exit" the standard state