Shopify order Fulfillments api endpoint not working.

Shopify Partner
30 0 3


I am creating a Shopify private app in which I am changing the fulfillment status of an order through API. now I am using the API endpoint






I can access all the others from the API credentials but for this only endpoint it is 



{"errors":"[API] Invalid API key or access token (unrecognized login or wrong password)"}



 I am a new Shopify developer. I saw one person saying change access mode but I don't know how can I do it.

I am using Shopify API key that starts with shppa_

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