Please help. Requesting by following giving me `Bad request`. curl -X POST https://api.sandbox.paypal.com/v1/oauth2/token \ -H 'Authorization: Basic {Your Base64-encoded ClientID:Secret}=' \ -d 'grant_type=authorization_code&code={authorization_code}' I encrypted `Base64-encoded ClientID:Secret` by btoa. authorization_code is used by capturing from redirect_url
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