Hi @amanda.post - great question! I think this may be a feature request, but please allow me to double check on this internally, and I’ll get back to you.

Hi @amanda.post - I’m still waiting to hear back from our integrations team. I hope to be in touch asap!

Hi @amanda.post - apologies for the delay here & appreciate your patience!

Amplitude’s Engineering team tested sending custom_args into the events, and it seems like it should be included successfully! Below is the payload & sample response --

{

  "api_key": "{{API_KEY}}",

  "events": n

    {

      "event_id": 699816350,

      "event_properties": {

        "attempt": "1",

        "custom_args": {

          "user_id": {{USER_ID}},

          "sample_data": "Hello World"

        },

        "email_category": "SPACE CONTENT ADDEDD",

        "response": "Email was deferred due to the following reason(s): aIPs were throttled by recipient server]",

        "sg_message_id": "GumQWe0iSSeZbNh_Gjg-pQ.filterdrecv-5766dd8c75-qzh67-1-627D17DF-90.0",

        "smtp-id": "<GumQWe0iSSeZbNh_Gjg-pQ@geopod-ismtpd-5-0>",

        "tls": 0

      },

      "event_type": " Sendgrid] deferred",

      "user_id": "{{USER_ID}}"

    }

  ]

}

-----

{

    "code": 200,

    "server_upload_time": 1661189475680,

    "payload_size_bytes": 21087,

    "events_ingested": 1

}

@jmagg Thanks so much for looking into that. We will give it a try on our end. :)