It is not possible to update a checkout object via Shopiy's Admin REST API unless the custom app created the checkout object.
Per Shopify Staff:
The checkout PUT endpoint is intended to only be used to modify checkouts that were created by that same app.
Reference:
Wow, what a great little API. Exchange Rates API is a free API that helps with currency conversion rates.
All that needs to be sent is the base currency and the currency that you want to convert. Then the conversion rate is returned. Making it simple.
Example
GET Request: https://api.exchangeratesapi.io/latest?base=USD&symbols=GBP
Result: {"base":"EUR","rates":{"USD":1.1264,"GBP":0.86168},"date":"2019-04-11"}
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