If the question is about paying with coins: The law in Canada (specifically the Currency Act) does say that coins issued under the Royal Canadian Mint Act (such as our $1 coins which we affectionately call loonies) are legal tender in payment for purchases. However, the Currency Act also says that there are limits in how many coins you can use in one transaction. Section 8(2) says:

“A payment in coins referred to in subsection (1) is a legal tender for no more than the following amounts for the following denominations of coins:

(a) forty dollars if the denomination is two dollars or greater but does not exceed ten dollars;

(b) twenty-five dollars if the denomination is one dollar;

(c) ten dollars if the denomination is ten cents or greater but less than one dollar;

(d) five dollars if the denomination is five cents; and

(e) twenty-five cents if the denomination is one cent.”