Requirement: 
Use this external api for show the exchange rate
here need keep EXCHANGE_RATE api key in the env file

https://v6.exchangerate-api.com/v6/927903321d4c19628365b0e1/latest/USD

when any request come to exchange route then at first it check the date if it not update today then it hit this api and save response data in my database as string full response covert to string then save database

here need 2 route 1 for full exchange rate other one for only BD or specific country then it the float value to nearest ceil integer value