Issuer and Acquirer Bank: Two Sides of a Card Payment

An issuer bank is the bank that handed the cardholder the card and holds either that person's account or that person's credit line. An acquirer bank is the bank that holds the merchant's account and takes the transaction in on the merchant's behalf. Every card payment has both. The two banks sit at opposite ends of it and they carry entirely different risks.

Every charge in a card payment is settled by the Reserve Bank of India and every one of them gets revised. A stated charge, a stated ceiling or a stated squaring-up time stops being true on the morning it changes, and it goes on looking authoritative while it is wrong. So the six rows below are drawn, named and left empty, to be filled from the site named beside each one on the day the answer is needed. Every rupee that does appear belongs to a single bank and a single reported year. The Rs 1,500/- purchase is an illustration, and no card count and no transaction volume stands behind it.

A card payment is not money travelling from one person to another. A card payment is an entry on one bank's books and a matching entry on another bank's books, arranged so that a claim the cardholder held on one bank turns into a claim the merchant holds on a different bank. Everything else in the arrangement, the plastic card, the machine on the counter, the message that crosses and the rules it crosses under, exists to make those two entries agree.

Here is the street version, and it is exact rather than merely friendly. A regular customer at a vegetable stall keeps a running account: she takes vegetables today and the stallholder writes it in a book. On Saturday she pays. Now put a second stall in it. She keeps her running account with the first stallholder, buys from the second, and the second stallholder will not take her word for anything because he has never met her. So the two stallholders keep a book between themselves and square that on Saturday instead. The second stallholder is trusting the first stallholder rather than the customer, and that single displacement is the whole of what a card payment does.

Which means there are two businesses in the arrangement from the very first second, holding two different people. The bank standing behind the cardholder is called the issuer. The bank standing behind the merchant is called the acquirer. Neither of them holds both customers, and that is why a card payment can go wrong in two completely different directions.

What is an issuer bank, and what does it hold for the cardholder?

An issuer bank is the bank that issued the card. Suvarna Commercial Bank Limited, an invented bank with one stated year of figures behind it, serves as the example. When Suvarna Commercial Bank Limited issues a card, it is not handing over money. The bank is handing over an instruction device. The card itself carries nothing at all; it identifies an account or an arrangement that the bank is already holding.

The bank holds one of two things, and the whole of its position turns on which one. Either it holds the cardholder's deposit. A deposit is a sum Suvarna Commercial Bank Limited owes that person, and it therefore sits on the liability side of its balance sheet. Or it holds the cardholder's credit lineAn amount a bank has agreed in advance to lend if and when the borrower draws on it. Until it is drawn, nothing has been lent and nothing appears on the lending side of the books.. A credit line is an agreement to lend, and it becomes something the bank is owed the moment the card is used. One of the two is money the cardholder already had and the other is a loan waiting to happen, so everything else about the issuer follows from which one it is holding.

The difference between the two sides is worth stating in everyday terms before the arithmetic arrives. A salary account and a credit card can sit at the same bank, on the same app, behind the same four digit code. To the cardholder they look like two doors into one place. On the bank's books they are on opposite sides of the sheet.

What is an acquirer bank, and what does it hold for the merchant?

An acquirer bank is the merchant's bank, and the verb in its name is the useful part: it acquires the transaction. The merchant does not send a card payment into the arrangement personally. The acquirer takes it in on the merchant's behalf, stands behind that merchant to everybody else in the arrangement, and is the party that eventually puts the proceeds where the merchant can reach them.

An acquirer bank holds the merchant's account. The merchant's account is a sum the acquirer owes the merchant, so it sits on the acquirer's liability side, exactly as the cardholder's deposit sits on the issuer's. Two banks, two liabilities, two entirely different customers. The acquirer has never met the cardholder and has no way of forming a view about that person. The issuer has never met the merchant and has no way of forming a view about that shop.

The everyday version clears up the commonest muddle in one line. The cardholder's bank is not the shop's bank, the shop's bank is not the cardholder's bank, and neither of them is the machine on the counter. The machine is equipment and nothing more. The machine may have been supplied by the acquirer or by somebody the acquirer works with, and it is not a party to anything: it collects the instruction and passes it on. When a merchant complains about what a card costs, the machine is not what is charging them.

What moves on the issuer's books when a debit card is used?

A debit card lives on the liability side, so start there. The cardholder had a balance at Suvarna Commercial Bank Limited before the purchase, and that balance was something the bank owed. The card is used for Rs 1,500/-, an illustration. Two things happen on the issuer's books and only two.

The first is that what Suvarna Commercial Bank Limited owes that cardholder falls by Rs 1,500/-. The second is that what Suvarna Commercial Bank Limited owes into the arrangement it will square through rises by Rs 1,500/-. Nothing was lent, nothing was earned in interest, and the bank is not one rupee smaller: one liability turned into another liability of exactly the same size.

Where does that cardholder's balance actually sit? Inside current and savings balances of Rs 80,640 crore, and those balances are 42.0 per cent of Suvarna Commercial Bank Limited's deposits of Rs 1,92,000 crore for its stated year. The deposit figure is as far as the record goes. The record does not break those balances down into accounts, so no card count, no transaction count and nothing about what any single account carries can be stated.

What moves on the issuer's books when a credit card is used?

Now run the same Rs 1,500/- purchase, an illustration again, on a credit card at Suvarna Commercial Bank Limited. The liability side does not move at all, and the reason is simple: there was no balance in question. The bank was not holding any money for that cardholder, so there was nothing to spend down.

The asset side moves instead. An advanceA bank's word for money it has lent and expects back. It sits on the side of the balance sheet that lists what the bank holds, because a loan is something the bank is owed. of Rs 1,500/- now exists that did not exist a second earlier, sitting inside the advances of Rs 1,44,000 crore that Suvarna Commercial Bank Limited carries for its stated year. Against it, what the bank owes into the settling arrangement rises by Rs 1,500/-. The balance sheet has grown on both sides at once. Growth on both sides is the plainest possible signal that this transaction was lending and the debit card one was not.

Readers merge these two more than any other pair, so say the difference out loud. A debit card moves the cardholder's own money. A credit card creates a loan. The plastic looks the same, the machine treats it the same way, the receipt reads the same, and on the issuer's books they are not remotely the same event.

What lands in the merchant's account, and who decides how much is taken out?

Cross to the other end of the same payment. The acquirer took the transaction in on the merchant's behalf, and what the acquirer owes that merchant now rises. The amount owed rises by the sale less whatever is deducted before the credit is made.

The deduction is the single most asked about number in card payments. How much is taken out, how it splits between the two banks and whether any ceiling sits over either part are all settled by the Reserve Bank of India. All of it gets revised, and none of it belongs to Suvarna Commercial Bank Limited or to any other bank to decide alone.

So the row gets drawn and left empty, with the Reserve Bank of India named inside it at rbi.org.in. The shape is a form: the arithmetic already laid out and the one moving figure left blank, to be filled from the source and be right, rather than read off a stale number and be wrong from whenever it last changed. A row filled in from recollection is not a service to the reader, it is a liability sitting quietly in the middle of a sheet that otherwise reconciles.

Why do the two banks never deal with each other directly?

Because neither of them can check the other one's customer, and a payment that depends on a check nobody can perform does not happen. An acquirer bank cannot form any view about a cardholder it has never met, has never assessed and holds no account for. An issuer bank cannot form any view about a merchant it has never onboarded and knows nothing about.

So a card networkThe arrangement that carries the message between the two banks and sets the single rule book both of them agree to work under. It is not a bank, it does not hold anybody's account and it is covered separately. sits between them, carries the message under one set of rules that both banks have already signed up to, and the two banks square up with each other afterwards. Neither bank is trusting the other bank's customer. Each bank is trusting the rule book, and through the rule book, the other bank.

The everyday version. Two shops in two different towns do not settle by trusting each other's regulars; they settle through an arrangement both of them already belong to. The arrangement does not sell anything, does not hold anybody's money and does not decide who is honest. The arrangement just makes sure that a message means the same thing at both ends and that somebody knows who owes what afterwards. SettlementThe moment two parties finish paying each other off, leaving nothing outstanding on either side. How it is actually carried out is covered separately. is the name for the moment the two banks actually square it.

Which bank carries which risk?

The issuer's risk and the acquirer's risk are not two shares of one risk. The two are different risks, at opposite ends of the same payment, and no arrangement in the middle moves either one onto the other bank.

The issuer carries the cardholder. On a credit card that is the plainest exposure there is: the issuer put up the money, an advance exists on its books, and whether that advance comes back is the issuer's problem alone. If the cardholder never pays, the loss sits inside the issuer's advances and shows up in the same place every other unpaid loan does.

The acquirer carries the merchant. The acquirer never lent anybody anything, so its exposure is a different kind and it catches people out. Its exposure is that the merchant does not deliver, or that the transaction comes back afterwards as a reversalA transaction that returns after it was accepted, so the money already credited has to be taken back out. Who bears one in which circumstances is settled by the regulator., at which point the acquirer has already credited a merchant that may have nothing left to take it back from. A cardholder who never pays is the issuer's problem and a merchant who never delivers is the acquirer's, and no route in the arrangement hands either one across.

Who decides what anybody is charged here?

The honest answer is that neither bank decides it alone. Five separate things about a card payment are settled outside the two banks and every one of them gets revised: the amount the two banks pass between each other, the charge a merchant pays for accepting a card, any ceiling over either of those, who bears a card transaction the cardholder never authorised, what authorisation a payment system operator has to hold, and when the two banks square up.

All of those belong to the Reserve Bank of India. A stated charge, a stated ceiling or a stated squaring-up time is not merely stale on the day it changes, it is false, and it goes on reading like a fact. The two balance sheets worked through above do not move when any of those change, and that steadiness is exactly why the account rests on them.

The vocabulary is worth having even without the figures. InterchangeThe arrangement under which the two banks in a card payment pass an amount between themselves. As a subject, including how it is set and what it costs, it is covered separately. is the word for what the two banks pass between themselves. Merchant discountThe arrangement under which a merchant is charged for accepting a card. Its size, its split and any ceiling over it are decided outside the two banks. is the word for the charge a merchant pays. A payment system operatorA body that runs a payment arrangement. Whether it may operate at all, and on what conditions, is a matter of authorisation from the regulator. is the kind of body that has to hold an authorisation before any of this may run at all. Knowing the words is what makes the source readable when the time comes to open it.

What does one Rs 1,500/- payment look like on both balance sheets at once?

Put the two cases side by side, on Suvarna Commercial Bank Limited as the issuer, with the Rs 1,500/- payment labelled as an illustration throughout. Every figure in the two rows below is read from the same stated year and worked out again here.

Now the acquirer's side of the same payment, and it is one line long. The merchant's bank owes that merchant Rs 1,500/- more, less whatever is deducted, and that deduction is an empty cell with the Reserve Bank of India named inside it at rbi.org.in. No amount, no share and no split appears anywhere above or below. The same Rs 1,500/- purchase produces a swap of one liability for another at one bank and a brand new loan at another, and the deciding factor is not the card but the arrangement behind it.

The honest boundary on all of this belongs beside the numbers rather than at the foot of the account. One year, one bank, nothing before it and nothing standing next to it, and no episode of trouble and no recovery anywhere in the whole thing. Two statements are therefore true together. Every entry above balances down to the last rupee, and none of it travels: it cannot be turned into a rate for some other stretch of time, it cannot be read as proof of anything about how well a card operation is run, and it stands in for no institution anywhere. Saying only the first of those makes this record sound much bigger than it is.

What does this record not carry, and why say so out loud?

Because an invented line would look exactly like a reported one. The invented line would sit in the same typeface, next to arithmetic that reconciles to the rupee, and nothing about it would announce that somebody made it up to finish a sentence. So the gaps get named instead of filled.

• One bank and one stated year. No quarter, no second year, no series of any kind.
• No split of the advance book by what it was lent for, by who borrowed it or by when it comes back.
• No card count, no transaction volume, no value passing over any card, and no charge of any kind.
• No borrower detail, no merchant detail, no branch count and no employee count.
• No split of the Rs 36,000 crore of assets that are neither advances nor investments.
• No split of what the bank paid out in interest between its deposits and the other Rs 24,000 crore of its funding side, and that other funding is left undescribed.

Where a figure of that kind is needed, the gap is stated plainly and the work proceeds on what exists. The Rs 1,500/- purchase is an illustration for that reason and not a measurement.

How does anybody use this once they are out of the classroom?

A shop owner uses it the moment a statement does not match the takings. The sales figure comes from the day at the counter; the credit comes from the acquirer; the gap between them is a deduction arranged elsewhere. Knowing that the acquirer is the party holding that account, and that it is not the machine supplier and not the shopper's bank, is what turns an argument with the wrong person into a question put to the right one.

Somebody reading a bank uses it differently. A bank's card business is not one business. The issuing side has cardholders and lends to some of them, so it shows up in advances and in whatever those advances do later. The acquiring side has merchants and lends to none of them, so it shows up as a service relationship with an entirely different exposure. Reading the two as one line is how a reader ends up attributing a credit loss to a business that never made a loan.

A cardholder uses it at the worst moment, and learning it early is the only way to have it ready. When an order does not arrive, one question opens the right door: whose account did each side of the payment touch? The card is the issuer's. The shop's takings are the acquirer's. Two banks, two different conversations, and one of them is the conversation that can actually reach the merchant.

What is worth keeping about the two banks?

Five sentences, and they carry the rest.

1. Every card payment has two banks in it. The issuer at the card end, the acquirer at the shop end, and neither one holds both customers.
2. The issuer holds either an account or a credit line. One of those is a liability of the bank and the other becomes an asset the moment the card is used.
3. A debit card swaps one liability for another and a credit card creates a loan. The balance sheet stays the same size in the first case and grows on both sides in the second.
4. The two banks never check each other's customer. A network carries the message under one rule book and the two of them square up afterwards.
5. The two risks sit at opposite ends and neither can be handed across. The unpaid card bill belongs to the issuer, the undelivered order to the acquirer.