---
description: Test ePrescription callback webhooks for asynchronous message processing and error handling.
---
# How to test Callback
Visit the Message Tester section within Surescripts workbench. From there, you can manage templates and compose messages.
{% hint style="warning" %}
Surescripts makes up to 3 additional delivery attempts with a delay of at least 1 minute, 5 minutes and then 10 minutes between each attempt.
{% endhint %}
Right now callback is supposed to be used for `NewRx` and `CancelRx` only.
Endpoint expects a `xml` body with message. In a Header element there is `RelatesToMessageID` tag which have to contain a message id that was generated on transmit. You can find it in a relevant `MedicationRequest` identifiers, eg `MedicationRequest.identifier.where(system = "urn:app:aidbox:e-prescriptions:surescripts:message-id").value`.
{% hint style="warning" %}
For `CancelRx` there is same `MedicationRequest` used, so to distinguish between `NewRx` and `CancelRx` there is type specified, eg:
{% endhint %}
```
{
"system": "urn:app:aidbox:e-prescriptions:surescripts:message-id",
"type": {
"coding": [
{
"system": "urn:app:aidbox:e-prescriptions:surescripts:serviceLevel",
"code": "Cancel"
}
]
},
"value": 123
}
```
Then the body with will be mapped and processed accordingly to message type.
## Examples for `NewRx` callback
* **Verify** message
<?xml version="1.0" encoding="utf-8"?>
<Message DatatypesVersion="20170712" TransportVersion="20170712" TransactionDomain="SCRIPT" TransactionVersion="20170712" StructuresVersion="20170712" ECLVersion="20170712">
<Header>
<To Qualifier="P">*ToEndpoint*</To>
<From Qualifier="D">*FromEndpoint*</From>
<MessageID>249afd334b944255863f11e08d234a0c</MessageID>
<RelatesToMessageID>249afd334b944255863f11e08d234a0c</RelatesToMessageID>
<SentTime>2017-06-23T19:34:31Z</SentTime>
<SenderSoftware>
<SenderSoftwareDeveloper>OneDeveloper</SenderSoftwareDeveloper>
<SenderSoftwareProduct>1Dev</SenderSoftwareProduct>
<SenderSoftwareVersionRelease>1</SenderSoftwareVersionRelease>
</SenderSoftware>
</Header>
<Body>
<Verify>
<VerifyStatus>
<Code>010</Code>
</VerifyStatus>
</Verify>
</Body>
</Message>
* **Error** message
<?xml version="1.0" encoding="utf-8"?>
<Message DatatypesVersion="20170712" TransportVersion="20170712" TransactionDomain="SCRIPT" TransactionVersion="20170712" StructuresVersion="20170712" ECLVersion="20170712">
<Header>
<To Qualifier="P">*ToEndpoint*</To>
<From Qualifier="D">*FromEndpoint*</From>
<MessageID>d1e736a88a88423ba5ea3a543a7f869d</MessageID>
<RelatesToMessageID>249afd334b944255863f11e08d234a0c</RelatesToMessageID>
<SentTime>2017-06-08T19:34:31.20Z</SentTime>
<SenderSoftware>
<SenderSoftwareDeveloper>OneDeveloper</SenderSoftwareDeveloper>
<SenderSoftwareProduct>1Dev</SenderSoftwareProduct>
<SenderSoftwareVersionRelease>1</SenderSoftwareVersionRelease>
</SenderSoftware>
</Header>
<Body>
<Error>
<Code>900</Code>
<Description>Sender ID not on file</Description>
</Error>
</Body>
</Message>
[^1]: Put your ID here