How is Discover different from a Visa or a MasterCard?
Each of those is a network. Merchants displaying their logos - participate in their network and will accept cards that bear the same logo. Most merchants participate in more than one network. Discover is mostly used in the US, while Visa, Mastercard and American Express are more widely spread in the world (Amex less, Visa and MC are much more widely spread). In addition to being widely spread in the US, Discover is accepted everywhere where UnionPay is accepted (mostly in China) and Diners Club (mostly in EMEA). Advantages/disadvantages? You'll have to compare specific cards, but if you're a traveler in the world - then Discover will probably not be as appealing as Visa or Mastercard. From the business side of credit cards, Discover and American Express carry their own risk. AmEx has lent their logo to banks such as Bank of America (BofA) to use the AmEx transaction network, but the financial risk and customer service is provided by BofA. Visa and MasterCard let banks use their logo and process through their respective networks for a fee. The financial risk of fraud, non-payment from merchants, etc is the risk that the individual banks carry.
"You must buy both tickets in 1 transaction and the purchased ticket cannot be purchased with miles. You'll pay full price (technically a ""paid published coach airfare"") for the first ticket and enter in your discount code for the companion fare which will ring up as $99 + fees ($118 in your example). If the regular price is $500, you'll book 2 tickets for $618 (one fare at $500 and companion fare at $118).     Companion Fare Discount Code Q & A What is the Companion Fare Discount Code that comes with my credit   card?  The Companion Fare Discount Code is offered to holders of the   Alaska Airlines Visa Signature® Card, The Platinum Plus® MasterCard®   and the Visa® Business Card. This Discount Code entitles the   cardholder to purchase one round-trip coach companion fare on Alaska   Airlines from $121 (USD) ($99 base fare plus applicable taxes and fees   from $22 depending on your Alaska Airlines flight itinerary) when   traveling with another passenger on a paid published coach airfare on   the same itinerary, booked at the same time. Mileage cannot be used as   a form of payment, however mileage credit accrual is allowed for both   travelers. Travelers are responsible for all applicable taxes, fees,   surcharges and applicable checked baggage fees. The Companion Fare   Discount Code is not valid with award travel, and cannot be combined   with other discounts. Source: Alaska Air Companion Fair Q&A" I did just what you suggest. The card company honored the charge, they told me the temporary number was solely for the purpose of assigning a number to one vendor/business. So even though I set a low limit, the number was still active and the card company paid the request. Small price to pay, but it didn't go as I wished.    For this purpose, I've used Visa/Mastercard gift cards. They are often on sale for face value and no additional fees. Many European countires allow you to an account for non-residents. You have to appear in the bank personally to open it, some of them even to get your own tax number for non-residents from the local government.  I'm not sure if you get a Visa (Electron) chip card immediatelly or you have to wait for like 3 months before being issued one. I've heard that getting a tax number for non-residents and opening a bank account is easily done in one day in Brezice, Republic of Slovenia. They seem to have agile local bureaucracy and banks, since many pople from neighbouring (non-EU) countries (used to) come there to open an EU bank account. Funds can be transfered via Internet banking - US banks have that, do they? SWIFT and IBAN codes are used for international money transfer. But it takes some time (days!) for it to arrive to destination. Tansfers below $20000 per month or per transaction are considered normal, but for amouts above that the destination bank might ask you to explain the purpose, to prove it is not illegal. Some of them accept the explanaiton in writing (they forward it to the regulator that tracks such large transfers), some of them ask you to appear there in person for an interview and to sign a statement. Can't believe US banks are still issuing paing magnet stripe cards like it's still 1980s. I'd expect Europe to be 10 years behind USA in technology, but this seems to be a weird reverse. I've beed using Internet banking with one-time passwd tokens and TAN lists for almost 10 years, and chip cards exclusivley for over 5y. Can't remeber the last time I've seen mag stripe card only. American Express (event the regular green one) got the chip at least 5 years ago. And it is accepted regularly in Europe. Alegedly it's more popular in Europe (although Mastercard is a definite #1, with Visa close to that) that in USA. "In my experience working at a currency exchange money service business in the US: Flat fees are the ""because we can"" fee on average. These can be waived on certain dollar values at some banks or MSBs, and sometimes can even be haggled.  If you Google EURUSD, as an example, you also get something like $1.19 at 4pm, 9/18/2017. If you look at the actual conversion that you got, you may find your bank hit you with $1.30 or something close to convert from USD to Euro (in other words, you payed 10% more USD per Euro). And, if you sell your Euro directly back, you might find you only make $1.07. This spread is the real ""fee"" and covers a number of things including risk or liquidity. You'll see that currencies with more volatility or less liquidity have a much wider spread. Some businesses even go as far as to artificially widen the spread for speculators (see IQD, VND, INR, etc.). Typically if you see a 3% surcharge on international ATM or POS transactions, that's the carrier such as Visa or Mastercard taking their cut for processing. Interestingly enough, you also typically get the carrier-set exchange rate overseas when using your card. In other words, your bank has a cash EURUSD of $1.30 but the conversion you get at the ATM is Visa's rate, hence the Visa fee (but it's typically a nicer spread, or it's sometimes the international spot rate depending on the circumstances, due to the overhead of electronic transactions). You also have to consider the ATM charging you a separate fee for it's own operation. In essence, the fees exist to pad every player involved except you. Some cards do you a solid by advertising $0 foreign exchange fees. Unfortunately these cards only insulate you from the processing/flat fees and you may still fall prey to the fee ""hidden"" in the spread. In the grander scheme of things, currency exchange is a retail operation. They try to make money on every step that requires them to expend a resource. If you pay 10% on a money transaction, this differs actually very little from the mark-up you pay on your groceries, which varies from 3-5% on dry food, to 20% on alcohol such as wine." A search quickly led to http://www.cardfellow.com/blog/debit-card-credit-card-difference-charges/ which shows the difference in merchant fees charged. A $200 charge costs $3.50-$3.60, a debit charge, $2.34-$2.39 but a PIN Debit, $1.87. The debit cards are a full percent less cost to the merchant, so the money collected is less to use for rewards. (I can't help but wonder how my card gives me 2% cash back, no fee, when I never pay interest.) One reason why some merchants in the US don't accept Discover is that the fee the store is charged is higher than the average. Generally a portion of transaction fee for the network and the issuing bank goes to the rewards program. In some cases a portion of the interest can also be used to fund these programs. Some cards will give you more points when you carry a balance from one month to the next. Therefore encouraging consumers to have interest charges. This portion of the program will be funded from the interest charges. Profits: Rewards: Some rewards are almost always redeemed: cash once the amount of charges gets above a minimum threshold. Some are almost never redeemed: miles with high requirements and tough blackout periods.  Credit cards that don't understand how their customers will use their cards can run into problems. If they offer a great rewards program that encourages use, but pays too high a percentage of points earned can lead to problems. This is especially true when a great percentage of users pay in full each month. This hurt Citibank in the 1990's. They had a card with no annual fee forever, and a very high percentage never had to pay interest. People flocked to the card, and kept it as an emergency card, because they knew it would never have a annual fee. "There are two fundamentally different reasons merchants will give cash discounts. One is that they will not have to pay interchange fees on cash (or pay much lower fees on no-reward debit cards).  Gas stations in my home state of NJ already universally offer different cash and credit prices.  Costco will not even take Visa and MasterCard credit cards (debit only) for this reason. The second reason, not often talked about but widely known amongst smaller merchants, is that they can fail to declare the sale (or claim a smaller portion of the sale) to the authorities in order to reduce their tax liability.  Obviously the larger stores will not risk their jobs for this, but smaller owner-operated (""mom and pop"") stores often will.  This applies to both reduced sales tax liability and income tax liability.  This used to be more limited per sale (but more widespread overall), since tax authorities would look closely for a mismatch between declared income and spending, but with an ever-larger proportion of customers paying by credit card, merchants can take a bigger chunk of their cash sales off the books without drawing too much suspicion. Both of the above are more applicable to TVs than cars, since (1) car salesmen make substantial money from offering financing and (2) all cars must be registered with the state, so alternative records of sales abound.  Also, car prices tend to be at or near the credit limit of most cards, so it is not as common to pay for them in this way." ACH, Paypal, Amazon Pay are all other options that can be used.  ACH is cheapest for the merchant but it is a bit of a pain for the customer to setup (aka adds friction to our sales process, which is *very* bad).  Paypal and Amazon Pay both cost a bit more than regular credit cards for the merchant.  Google Wallet is free but not available unless you are a sole proprietor or an individual, which is is useless for businesses.  So yeah, other options are either difficult or more expensive.