This article will be a brief overview of how to use the API to add a new Participant or edit an existing one.

<a href="https://intercom.help/eto/en/articles/3027614-api-how-to-log-into-the-api" rel="nofollow noopener noreferrer" target="_blank">Authenticate to the API</a>

If editing an existing Participant, you can use the GET /API/Actor.svc/participant/{participantID} endpoint to gather existing Participant information, including the Participant Site ID and any demographic-related IDs (CDID or other)

- Enterprise GUID
- Security Token
- For the SaveParticipantWrapper, you only need the fields relevant to your ETO Site.

1. <a href="https://intercom.help/eto/en/articles/3027614-api-how-to-log-into-the-api" rel="nofollow noopener noreferrer" target="_blank">Authenticate to the API</a>
2. If editing an existing Participant, you can use the GET /API/Actor.svc/participant/{participantID} endpoint to gather existing Participant information, including the Participant Site ID and any demographic-related IDs (CDID or other)
3. Input the below information:
 - Enterprise GUID
 - Security Token
 - For the SaveParticipantWrapper, you only need the fields relevant to your ETO Site.

Your request body may end up looking something like the one below:

"participant":{ "FirstName": "Takumi", "LastName": "Fujiwara", "DateOfBirth": "/Date(-441918000000-0500)/", "CustomDemoData":[ { "CDID": ####, "value": "Test", "CharacteristicType": # } ], "SiteID": ##, "ProgramID": ###, "ID": ##### }

For custom demographics, you typically would need to include the CDID along with the Value and at least one other attribute.

We recommend filling out any demographic values your agency has marked for Duplicate Check or Required, as this will help to avoid possible errors.

If inserting a new Participant, you can omit the "ID" field. The ID field will always be the Participant Site Identifier, not the Case Number, as they can sometimes be different values.

You may run into an error stating that a duplicate check error occurred. Please ensure that you fill out the SiteID, ProgramID, and ID fields with the proper values, along with your other demographic values.

- For custom demographics, you typically would need to include the CDID along with the Value and at least one other attribute.
- We recommend filling out any demographic values your agency has marked for Duplicate Check or Required, as this will help to avoid possible errors.
- If inserting a new Participant, you can omit the "ID" field. The ID field will always be the Participant Site Identifier, not the Case Number, as they can sometimes be different values. 
- You may run into an error stating that a duplicate check error occurred. Please ensure that you fill out the SiteID, ProgramID, and ID fields with the proper values, along with your other demographic values.

Notes: