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Commerce API POST Endpoints returning 401 Unauthorized

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I am trying to update product variants and adjust stock quantities for products using the commerce API endpoints as seen here and here. I am running into an issue where it is giving me a 401 unauthorized request although I have all of the required headers, as well as the correct body. I can make this POST request through Postman no problem but trying to make an identical request through javascript only returns 401 unauthorized. 

Simple example (using product variant endpoint):

await axios.post(`${API_URL}/${productId}/variants/${variantId}`, {

headers: {

'Authorization': 'Bearer ' + API_KEY,

'Content-Type': 'application/json',

'User-Agent': 'blahblahblah'


body: body

}).then(function (data) {



.catch(function (error) {



If anyone could provide guidance on why this is happening and how to fix that would be greatly appreciated!

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