Argument type of a user defined function: Help correct syntax

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Facing hurdle in understanding the correct code for line 12:

long amex = checkifamex(long y);

I guess instead of long y as argument, there might be reference to function enterccno. Help regarding the correct syntax appreciated.

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#include <stdio.h>
#include <cs50.h>

long enterccno (void);//long type as 14-digit credit card will not fit into the memory as int type
long checkifamex (long enterccno);

int main(void)
{
    long y = enterccno();
    printf("credit card no. entered is %ld",y);

    long amex = checkifamex(long y);
    printf("entered amex is %ld",amex);
}

long enterccno (void) //It will take void as argument as the function will not initially take any particular long value as input to begin with.
{
    long x = get_long("enter creditcardno");//get_long function by cs50.h leveraged to accept input of creditcard no. from user.
    return x;//stored x value or entered creditcardno transferred inside the main function when entercccno function called.
}

long checkifamex (long y)
{
    long x = y;
    return x;
}

			

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The correct syntax on line 12 should be:

long amex = checkifamex(y);

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