Hi There,

I will have a form to display in my UI. Submitting the form will trigger an api call to the server in which am making a POST reques to klaviyo

This way 
 

import { NextRequest, NextResponse } from "next/server";

export async function POST(request: NextRequest) {
  try {
    const { email, firstName, lastName } = await request.json();


    const klaviyoApiUrl = `https://a.klaviyo.com/api/v2/list/${process.env.LIST_ID}/members`;
    const res = await fetch(klaviyoApiUrl, {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        Authorization: `Klaviyo-API-Key ${process.env.KLAVIYO_PRIVATE_API_KEY}`,
      },
      body: JSON.stringify({
        profiles: :
          {
            email: email,
            first_name: firstName,
            last: lastName,
          },
        ],
      }),
    });

    const data = await res.json();
    if (!res.ok) {
      console.error("Klaviyo API Error:", data);
      throw new Error(data.message || "Failed to subscribe to Klaviyo");
    }

    return NextResponse.json({ success: true });
  } catch (error: any) {
    console.error("Subscription Error:", error);
    return NextResponse.json({ success: false, error: error.message }, { status: 500 });
  }
}

I m keep getting 
 

Klaviyo API Error: { message: 'The API key specified is invalid.' }
Subscription Error: Error: The API key specified is invalid.

While I tried old API key and created new API private key with full access. Both result the same.

Any help would be appreciated.

Thank you