WooCommerce REST API Endpoints Not Being Cached with OAuth 1.0

Hello,

I'm currently using the WP REST Cache plugin alongside the WooCommerce REST API, and I'm encountering an issue where the /wc/v3/products and /wc/v3/products/categories endpoints are not being cached as expected.

We are authenticating requests using OAuth 1.0, and even after forcing all OAuth query parameters to remain constant (e.g., hardcoding oauth_nonce, oauth_signature, etc.), the plugin still fails to cache the responses. Inside the plugin’s "Request Headers" tab, we consistently see:

json
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{"authorization": null}
This suggests the Authorization header is not being detected or passed correctly, even though we are using valid OAuth-signed requests.

All the appropriate filters are in place (wp_rest_cache/allowed_endpoints, cacheable_request_headers, etc.), and a unique cache key is being generated, but the cache is still missed every time.

Could you please advise on how to ensure the plugin recognizes OAuth 1.0 credentials and allows caching for these WooCommerce endpoints?

Thank you!

this my code 

function wprc_add_wc_endpoints( $allowed_endpoints ) {

    if ( ! isset( $allowed_endpoints[ 'wc/v3' ] ) ) {

        $allowed_endpoints[ 'wc/v3' ] = [];

    }

    // Add WooCommerce API endpoints for caching

    $allowed_endpoints['wc/v3'][] = 'products';

    $allowed_endpoints['wc/v3'][] = 'products/categories';

    return $allowed_endpoints;

}

add_filter('wp_rest_cache/allowed_endpoints', 'wprc_add_wc_endpoints', 10, 1);

// Add cacheable request headers for authorization

function wprc_add_cacheable_request_headers( $cacheable_headers ) {

    $cacheable_headers['wc/v3/products'] = 'authorization';

    $cacheable_headers['wc/v3/products/categories'] = 'authorization'; // Ensure categories are also cached

    return $cacheable_headers;

}

add_filter('wp_rest_cache/cacheable_request_headers', 'wprc_add_cacheable_request_headers', 10, 1);

// Determine object type for WooCommerce products, categories, and orders

function wc_determine_object_type( $type, $cache_key, $data, $uri ) {

    if ( strpos( $uri, '/wp-json/wc/v3/products/categories' ) !== false ) {

        return 'product_cat';

    } elseif ( strpos( $uri, '/wp-json/wc/v3/products' ) !== false ) {

        return 'product';

    }

    return $type;

}

add_filter( 'wp_rest_cache/determine_object_type', 'wc_determine_object_type', 10, 4 );

add_filter('wp_rest_cache/cache_query_params', function($cache_query_params, $request_uri) {

    if (strpos($request_uri, '/wc/v3/products/categories') !== false || strpos($request_uri, '/wc/v3/products') !== false) {

        $allowed_params = ['per_page', 'orderby', 'order', 'category', 'search', 'include', 'exclude', 'slug', 'status', 'stock_status', 'page'];

        if (!is_array($cache_query_params)) {

            $cache_query_params = [];

        }

        $cache_query_params = array_unique(array_merge($cache_query_params, $allowed_params));

    }

    return $cache_query_params;

}, 10, 2);

// Flush product and category cache on category changes

function wc_flush_product_and_category_caches() {

    $caching = \WP_REST_Cache_Plugin\Includes\Caching\Caching::get_instance();

    // Flush both product and category caches

    $caching->delete_cache_by_endpoint( '/wp-json/wc/v3/products', \WP_REST_Cache_Plugin\Includes\Caching\Caching::FLUSH_LOOSE );

    $caching->delete_cache_by_endpoint( '/wp-json/wc/v3/products/categories', \WP_REST_Cache_Plugin\Includes\Caching\Caching::FLUSH_LOOSE );

}

add_action( 'created_product_cat', 'wc_flush_product_and_category_caches', 10 );

add_action( 'edit_product_cat', 'wc_flush_product_and_category_caches', 10 );

add_action( 'delete_product_cat', 'wc_flush_product_and_category_caches', 10 );

add_action( 'save_post_product', 'wc_flush_product_and_category_caches', 10 ); // Clear cache on product updates