Prepare the API token of CurrencyLayer

[jeffchao98]

• Create the free account at CurrencyLayer
• Research the api we need to can use in the app

[jeffchao98]

Step 01 - API for get the available currency list

• Url format

http://apilayer.net/api/list?access_key=${access_token}&format=1

• Output example

{
  "success":true,
  "terms":"https:\/\/currencylayer.com\/terms",
  "privacy":"https:\/\/currencylayer.com\/privacy",
  "currencies":{
    "AED":"United Arab Emirates Dirham",
    "AFN":"Afghan Afghani",
    "ALL":"Albanian Lek",
...

• Only the currencies section is the content what we concern

[jeffchao98]

Step 02 - API for get the currency rate list

• Url format

http://www.apilayer.net/api/live?access_key=${access_token}&format=1

• Output example

{
  "success":true,
  "terms":"https:\/\/currencylayer.com\/terms",
  "privacy":"https:\/\/currencylayer.com\/privacy",
  "timestamp":1574438946,
  "source":"USD",
  "quotes":{
    "USDAED":3.67275,
    "USDAFN":78.350265,
    "USDALL":111.050182,
...

• Only the quotes section is the content what we concern
• The free plan can not use source attribute for switch
  • but we can do the calculation when the user select the query currency