Woocommerce Rest Api Post Method

When i try to create a customer using POST method from Postman google Chrome extension ,
i get the error saying Invalid Signature – provided signature does not match but GET method is working properly.
Eg : https://www.eshop.com/wc-api/v3/customers?oauth_consumer_key=ck_7a079fc8c0c013d982f395c65a2b8a4117f770a8&oauth_signature_method=HMAC-SHA256&oauth_timestamp=1494486341&oauth_nonce=KgsId0&oauth_version=3.0&oauth_signature=fa1Y/SGpt6wGDsjjTVBKmox3MpOTUWCqZxUE/Abxwfk=

Returns Error as :
{
“errors”: [
{
“code”: “woocommerce_api_authentication_error”,
“message”: “Invalid Signature – provided signature does not match”
}
]
}

Thank you