Payment Processing requests relate to the Checkout API.
To gain the orders access scopes (which will give you access to the the last 60 days of orders) you’d need to requestorders access scopes during the Oauth process for public apps. When the merchant installs your app, they would accept the orders app scopes as part of the standard app installation flow.
Additionally if you need them, you can request to read_all_orders from your partner dash(documentation) - This request to read all orders then goes through an Approval process with Partner Support. Hope that helps!
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