i'm using woo api rest ("woocommerce-api": "1.4.2") in my ionic 3 application.
when i send a post request i get this error : 

code :
  signUp() {
    let customerData = {
      "email": this.newUser.email,
      "first_name": this.newUser.first_name,
      "last_name": this.newUser.last_name,
      "username": this.newUser.username,
      "billing": {
        "first_name": this.newUser.first_name,
        "last_name": this.newUser.last_name,
        "company": "",
        "address_1": this.newUser.billing_address.address_1,
        "address_2": this.newUser.billing_address.address_2,
        "city": this.newUser.billing_address.city,
        "state": this.newUser.billing_address.state,
        "postcode": this.newUser.billing_address.postcode,
        "country": this.newUser.billing_address.country,
        "email": this.newUser.email,
        "phone": this.newUser.billing_address.phone
      },
      "shipping": {
        "first_name": this.newUser.first_name,
        "last_name": this.newUser.last_name,
        "company": "",
        "address_1": this.newUser.shipping_address.address_1,
        "address_2": this.newUser.shipping_address.address_2,
        "city": this.newUser.shipping_address.city,
        "state": this.newUser.shipping_address.state,
        "postcode": this.newUser.shipping_address.postcode,
        "country": this.newUser.shipping_address.country
      }
    };
    if (this.billing_shipping_same) {
      customerData.shipping = customerData.billing;
    }
    this.WooCommerce.postAsync("customers",customerData).then(
        (data)=>{
            console.log(JSON.parse(data.body));
        }
    );
  }
but when I send the post request using postman it work also get requests work correctly, I have the problem only in the post!
 
    