# Writing to Adobe Marketo Engage entities
<a name="adobe-marketo-engage-writing-to-entities"></a>

**Prerequisites**
+ An Adobe Marketo object you would like to write to. You will need the object name such as `leads` or `customobjects`.
+ The Adobe Marketo connector supports three write operations:
  + INSERT
  + UPSERT
  + UPDATE
+ For `UPSERT` and `UPDATE` write operations, you must provide the `ID_FIELD_NAMES` option to specify the ID field for the records. When working with the `leads` entity, use `email` as `ID_FIELD_NAMES` for `UPSERT` operations and `id` for `UPDATE` operations. For the `customobjects` entity, use `marketoGUID` as `ID_FIELD_NAMES` for both `UPDATE` and `UPSERT` operations.

**Supported entities for Destination (Synchronous)**


| Entity name | Will be supported as Destination Connector | Can be Inserted | Can be Updated | Can be Upserted | 
| --- | --- | --- | --- | --- | 
| leads | Yes | Yes(Bulk) | Yes(Bulk) | Yes(Bulk) | 
| customobjects | Yes | Yes(Bulk) | Yes(Bulk) | Yes(Bulk) | 

**Example**:

**INSERT Operation:**

```
marketo_write = glueContext.write_dynamic_frame.from_options(
    frame=frameToWrite,
    connection_type="marketo",
    connection_options={
        "connectionName": "connectionName",
        "ENTITY_NAME": "leads",
        "API_VERSION": "v1",
        "WRITE_OPERATION": "INSERT"
    }
```

**UPDATE Operation:**

```
marketo_write = glueContext.write_dynamic_frame.from_options(
    frame=frameToWrite,
    connection_type="marketo",
    connection_options={
        "connectionName": "connectionName",
        "ENTITY_NAME": "leads",
        "API_VERSION": "v1",
        "WRITE_OPERATION": "UPDATE",
        "ID_FIELD_NAMES": "id"
    }
```

**Note**  
For the `leads` and `customobjects` entities, Adobe Marketo provides endpoints to fetch metadata dynamically so the writable fields are identified from the Marketo API response.