## PushToAgentOptions.returnAck property [​](/content/docs/sdk/core.pushtoagentoptions.returnack#pushtoagentoptionsreturnack-property/index.html)

The ACK-level that the agent should wait for when sending HL7 messages. 
- `'first'`: Return on the first ACK message received (default)  
- `'application'`: Wait for application-level ACK (AA), skipping commit ACKs (CA)

**Signature:**

```typescript
returnAck?: ReturnAckCategory;
```

- [PushToAgentOptions.returnAck property](/content/docs/sdk/core/pushtoagentoptions.returnack#pushtoagentoptionsreturnack-property/index.html)