Android : Paypal sdk- INSTRUMENT_DECLINE ERROR

I integrate paypal android sdk into my android aps as according to the

github.com/paypal/PayPal-Android-SDK/blob/master/docs/single_payment.md

I created paypal aps through

developer.paypal.com/webapps/developer/applications/myapps which provides me sandbox client id and live client id.

Everything works fine, when

private static PayPalConfiguration config = new PayPalConfiguration()

    // Start with mock environment.  When ready, switch to sandbox (ENVIRONMENT_SANDBOX)
    // or live (ENVIRONMENT_PRODUCTION)
    .environment(PayPalConfiguration.ENVIRONMENT_SANDBOX)
    .clientId("<sandbox cliend id>");

But when I switch to PaypalConfiguration.ENVIRONMENT_PRODUCTION and clientId to live client id , it gives me error :

{"name":"INSTRUMENT_DECLINED","message":"The instrument presented  was either declined by the processor or bank, or it can't be used for this payment.","information_link":"https://developer.paypal.com/webapps/developer/docs/api/#INSTRUMENT_DECLINED","debug_id":"bd919720c3913"}
09-29 09:53:35.107: E/PayPalService(4811): INSTRUMENT_DECLINED

I did not find the information about the error in https://developer.paypal.com/webapps/developer/docs/api/#INSTRUMENT_DECLINED as well.