401 Unauthorized can't call Merchants_GetPaymentStatus

I made a test payment 'Reserve' via mobile app (AppSwitch) with testing merchantId 'APPDK0000000000' and recevied orderId: 't-1340021'. Then I would like to verify the payment status by calling Merchants_GetPaymentStatus via this portal. But got 401. Attached is the screenshot. Anything I did incorrect? Look forward to hearing from you.

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