With 170+ Currencies supported currencies in ASTPP, For currency exchange services ASTPP using third-party services to manage currency conversion process.
About 3rd party integrations.
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If you are using third party (Fixer) services for the currency rate conversion then please take a note it has been done by the external service.
ASTPP back-end services just get the updated rates and set it to the system database for the conversion but in-case of the rates are not updated or incorrect then ASTPP is not responsible for that. You have to take care of it every day.