A bank customer expecting to pay its Brazilian supplier BRL 100 million asks Alpha Bank...

When Alpha Bank completes a foreign exchange matched transaction, it buys Brazilian reals in the market immediately after selling them to the customer, thus matching the position. This process eliminates market risk as the bank is no longer exposed to fluctuations in the exchange rate between the Australian dollar and the Brazilian real.

Customer Transaction:

Alpha Bank sells BRL 100 million to the customer and receives AUD 1,010,000.

Market Transaction:

Alpha Bank immediately buys BRL 100 million in the market at the rate of 100, paying AUD 1,000,000.

By matching its position, the bank ensures that it is not exposed to changes in the exchange rate, thereby eliminating market risk.

References

Source: How Finance Works​