Enable method POST wordpress/Woocommerce

Question

I’m trying to send a POST for Woocommerce/wordpress using the API Woocommerce-api, but I only get the error 401 what it says:

Fetch API cannot load http://wc-project.dev/wp-json/wc/v1/orders... Response for preflight has invalid HTTP status code 401

Typeerror: Failed to fetch at Typeerror (Native)

I already tried to add the permission via htaccess with:

<IfModule mod_headers.c>
    Header add Access-Control-Allow-Origin: "http://localhost:3000"
    Header add Access-Control-Allow-Methods: "GET,POST,OPTIONS,DELETE,PUT"
    Header add Access-Control-Allow-Headers: "Content-Type"
    Header add Access-Control-Allow-Credentials: "true"
</IfModule>

I also tried right in the header.php of my theme:

header("Access-Control-Allow-Origin: *");

And also in the archive functions.php:

header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Methods: *");

The POST being performed from an application REACT through the local server that is made available through the react-scripts start

By clicking on link provided by error I receive the following JSON:

{"code":"woocommerce_rest_authentication_error","message":"Assinatura inv\u00e1lida - a assinatura fornecida n\u00e3o corresponde.","data":{"status":401}}

The keys of API already have permission and reading and writing.