Ionic4 how to create order in woocommerce?

even though I hard coded my customer key and secret key ,
it return error saying woocommerce_rest_cannot_view

I tried on my real device . but saying same
Failed to load resource: the server responded with a status of 401 ()

How can I create new order with http request…

const data = {
        payment_method: "bacs",
        payment_method_title: "Direct Bank Transfer",
        set_paid: true,
        billing: {
          first_name: "John",
          last_name: "Doe",
          address_1: "969 Market",
          address_2: "",
          city: "San Francisco",
          state: "CA",
          postcode: "94103",
          country: "US",
          email: "john.doe@example.com",
          phone: "(555) 555-5555"
        },
        shipping: {
          first_name: "John",
          last_name: "Doe",
          address_1: "969 Market",
          address_2: "",
          city: "San Francisco",
          state: "CA",
          postcode: "94103",
          country: "US"
        },
        line_items: [
          {
            product_id: 93,
            quantity: 2
          },
          {
            product_id: 22,
            variation_id: 23,
            quantity: 1
          }
        ],
        shipping_lines: [
          {
            method_id: "flat_rate",
            method_title: "Flat Rate",
            total: 10
          }
        ]
      };

        const orderObj = {};
        orderObj['payment_method'] = data.payment_method
        orderObj['payment_method_title'] = data.payment_method_title
        orderObj['customer_id'] = this.filter.customer_id
        orderObj['billing'] = data.billing
        orderObj['shipping'] = data.shipping
        orderObj['line_items'] = data.line_items
    
         const headers = new HttpHeaders({
          'Content-Type': 'application/x-www-form-urlencoded'
        });
        return new Promise(resolve => {
          this.http
            .post(
              "https://www.dentpro.shop/wp-json/wc/v3/orders/?consumer_key="+"ck_85f5d88dd29b348e373ab5f31d40608xxxxxxx"+"'&consumer_secret=cs_1e33534bae4f4fbc0e19762864bxxxxxx",
              orderObj,
              { headers }
            )
            .subscribe(data => {
              console.log("data is : ");
              console.log(data);
              resolve(data);
            });
        });