GET /customer/partners/:partner_id/merchant-integrations/:seller_id not returning oauth payload

[ansont]

First getting the action_url from V2/customer/partner-referral

Then getting the merchantIdInPayPal from the return URL,

I'm able to call GET /customer/partners/:partner_id/merchant-integrations/:seller_id successfully.

However, it does not return the oauth_integration payload described here: https://developer.paypal.com/docs/platforms/seller-onboarding/before-payment/

I'm using the sandbox account. I receive the following response:

{
  "merchant_id": "H95MNQKGDS4FU",
  "tracking_id": "130603461826449",
  "products": [
    {
      "name": "MOBILE_PAYMENT_ACCEPTANCE",
      "status": "ACTIVE"
    }
  ],
  "payments_receivable": true,
  "primary_email_confirmed": true
}