In this situation, it's in the best interest of the merchant to verify the cardholder's information including the credit card number, expiration date, address and CVV value for accuracy and legitimacy. The only way of doing this today is by doing a $1.00 authorization (Visa refers to these as Ghost Authorizations).
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according to 802 11 1999 received strength signal indicator rssi is a phy layer measure of the energy observed by the antenna used to receive the current ppdu in other words the relative strength of the physical rf carrier signal as communicated to the mac layer