Issues getting a list of Payments

[AntaresColl]

When I make a GET call to 

https://connect.squareup.com/v1/locations/{location_id}/payments

I get the following error message:

{
    "type": "unauthorized",
    "message": "Provided merchant_id and merchant_id in authorization do not match up"
}

My issue is the same as this thread. I've checked that I am passing the correct access token in the Authorization header and the location_id does belong to this merchant.

Other notes:
When I make a GET call to

https://connect.squareup.com/v2/locations/{location_id}/transactions

using the same Authorization header, it works.

[Helen]

@AntaresColl This error is usually caused by incorrect information being passed, but if you've double checked that you're using the correct location id go ahead and contact our API Support team directly so they can take a closer look.