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How can I fix Error 10001: Internal Error for PayPal Pro?



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How can I fix Error 10001: Internal Error for PayPal Pro?

We are live with PayPal pro and accepting credit cards. It works very well but we used a custom solution that we built ourselves. It is in PHP, here is the nvpStr call - all values are urlencoded:

$nvpStr = "&PAYMENTACTION=$paymentType&AMT=$amount&CREDITCARDTYPE=$creditCardType&ACCT=$creditCardNumber".
"&EXPDATE=$padDateMonth$expDateYear&CVV2=$cvv2Number&FIRSTNAME=$firstName&LASTNAME=$lastName".
"&STREET=$address1&CITY=$city&STATE=$state&ZIP=$zip&COUNTRYCODE=$country&CURRENCYCODE=$currencyID".
"&IPADDRESS=$ipAddress&RETURNFMFDETAILS=1";

One user is getting a 10001: Internal Error return error but it is still charging his card. The odd thing is, he actually had one transaction go through without any error at all but the following 3 transcations all errored out.

Any ideas on what I can do to fix this or what could cause PayPal pro to return a 10001 error?

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