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If you need to add additional properties to a content or media node before it’s ingested into Enterspeed, you can use EnterspeedPropertyDataMappers or EnterspeedPropertyMetaDataMappers.
You can also create a Custom Property Service and override some of the MapAdditionalProperties methods, however mappers are more flexible if you are doing conditional mapping, like only adding additional properties for specific content types.

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Mappers

With mappers you can create small effective classes to map additional properties for types that matches a filter, e.g. all nodes of a specific type. You can create mappers to add properties to the properties object or the meta-data object. Note that we in this example are using StringEnterspeedProperty. You can choose between multiple property types. (Array, boolean, number, object and so on.)

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Example

// Data mapper example
public class SlugDataMapper : IEnterspeedPropertyDataMapper
{
    public bool IsMapper(IPublishedContent content)
        => content.ContentType.Alias == "contentPage";

    public void MapAdditionalData(IDictionary<string, IEnterspeedProperty> data, IPublishedContent content, string culture)
    {
        // some logic

        data["slug"] = new StringEnterspeedProperty("slug", "mySlugValue");
    }
}

// Meta-data mapper example
public class SlugMetaDataMapper : IEnterspeedPropertyMetaDataMapper
{
    public bool IsMapper(IPublishedContent content)
        => content.ContentType.Alias == "contentPage";

    public void MapAdditionalData(IDictionary<string, IEnterspeedProperty> metaData, IPublishedContent content, string culture)
    {
        // some logic

        metaData["slug"] = new StringEnterspeedProperty("slug", "mySlugValue");
    }
}

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Registering your new property service

The mappers are registered in Umbraco via an IComposer. Umbraco 9+ 
public class MyCustomComposer : IComposer
{
    public void Compose(IUmbracoBuilder builder)
    {
        builder.EnterspeedPropertyMetaDataMappers()
                .Append<SlugMetaDataMapper>();
    }
}
Umbraco 8 
[RuntimeLevel(MinLevel = RuntimeLevel.Run)]
public class MyCustomComposer : IUserComposer
{
    public void Compose(Composition composition)
    {
        composition.EnterspeedPropertyMetaDataMappers()
                    .Append<SlugMetaDataMapper>();
    }
}
You should now be able to see the data you have mapped, in the data for your source entities in Enterspeed. 
"metaData": {
	"name": "Tattoo",
	"culture": "en-us",
	"sortOrder": 0,
	"level": 3,
	"createDate": "2022-09-05T15.48.36",
	"updateDate": "2022-09-05T15.48.37",
	"nodePath": [
		"1097-en-us",
		"1098-en-us",
		"1099-en-us"
	],
	"slug": "mySlugValue"  👈👈👈
}