DEXF#4: Whitelist custom token to test price alerts

Whitelist TEST502 token,
TEST502 (TEST502) Token Tracker | BscScan so quote_rate shows up

Whitelisting TEST502 will be a bit tricky, because its not an “active” pool ( *no swaps for over 7 days: Engineer would have to write a fair amount of code to get it to work, but thats ok since it will allow for addition whitelisting requests as they come by. But that can only happen after 2 weeks when he is available.