Spot foreign exchange buying price refers to the foreign exchange transaction price when the foreign exchange deposited in the bank account is converted into RMB.
The buying price of cash refers to the foreign exchange transaction price when foreign exchange cash is converted into RMB.
Selling price refers to the foreign exchange transaction price executed when buying foreign exchange with RMB.
Buying and selling are all from the perspective of banks. For example, if you change foreign exchange into RMB, then the bank is equivalent to buying foreign exchange in RMB, so the purchase price is implemented.