Costco customer service is excellent it is easy to do over the phone and easy to shop at Costco for there products and the gas prices are lower.

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Costco Q&A(7 questions)
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How much does Costco pay Visa?
Costco pays Visa an interchange fee of around 0.4% for each Visa credit card transaction at Costco stores. Costco struck a deal with Visa for this greatly reduced interchange fee in 2016, and the membership warehouse club agreed to accept only Visa cards at its stores in exchange.
By partnering exclusively with Visa and negotiating a low interchange fee, Costco can pass extra savings on to its members. Meanwhile, most other merchants still must pay the credit card networks a surcharge of around 2% to 3% of the purchase amount to process credit card transactions.
It's worth noting that prior to its agreement with Visa, Costco only accepted American Express credit cards at its stores. Costco was paying American Express a 0.6% interchange fee, still considerably lower than the standard interchange fee. Costco ended the deal with American Express after the two sides were unable to negotiate an even lower fee.
How do I pay with Citibank at Costco?
Can I use my Citibank card at Costco?
Yes, you can use your Citibank card at Costco if it's a Visa card. Costco accepts all Visa credit cards as a form of payment, along with cash, debit cards, checks and mobile payments, but it does not accept Mastercard, Discover, or American Express credit cards.
Most Citibank credit cards are on the Mastercard network with a few exceptions, such as the Costco Anywhere Visa® Card by Citi and the Costco Anywhere Visa® Business Card by Citi. These cards are affiliated with Costco, but they can be used anywhere that accepts Visa cards.