### Update a contact

Updating the details of a Voyado Engage contact is done through the /contacts endpoint using their contactId:

POST /api/v2/contacts/{contactId}

If you don’t have the contactId, you can get it using other contact attributes.

When you have the contactId you call the endpoint like this:

POST /api/v2/contacts/430d3329-7eef-45c0-37f9-ae9300a0daceid

As the payload, send ONLY the attributes that you want to change:

{
"lastName": "Examplesson",
"street": "New Street 1337"
}


In this example, the contact has changed their surname and moved to a new address. These attributes will now be updated.

#### Changing contact type for a contact

To update contactType to Member (also known as promoting to member) you have to use this endpoint:

POST /api/v2/contacts/{contactId}/promoteToMember

For changing to any other contactType you will need to use a different endpoint:

POST /api/v2/contacts/{contactId}/updateContactType?contactTypeId=MyType

Note that if you try to update to Member using this endpoint, it will not work. In that case, you will have to use the first option.

### Caution

Promote a contact to Member only with the /promoteToMember endpoint.

#### Don't send empty values

You need to be careful to never send empty values in the JSON payload when updating a contact. If a field exists in the payload, Engage will use that value and overwrite the existing one. For example, if a contact's last name isn’t added in the POS, do not add that field to the payload.

// DO NOT DO THIS!
{
"firstName": "Example",
"lastName": "",
"street": "Big Street 1234"
}


In this case, the current value of lastName will be overwritten by an empty string. You probably don't want this.

// This is how to do it
{
"firstName": "Example",
"street": "Big Street 1234"
}


Note also that a field which does not exist in the contact's data will be ignored and no error will be returned. So it's important to make sure you are sending the right name for each field.

// This update will be ignored
{
"firstNam": "Example",
}


#### Responses

A successful update will return HTTP 200 Ok along with the contact's new data set as the response body.

If the request has not been successful, you'll get one of the following HTTP error codes:

• 400 : NoData