Paypal Sandbox：DoExpressCheckoutPayment 10001内部错误

Question

I'm currently working on an e-commerce website, I have integrated Paypal (Express Checkout) and it worked well until yesterday.

When I send the DoExpressCheckoutPayment Request, I receive this response :

  "ACK" => "Failure"
  "VERSION" => "204.0"
  "BUILD" => "000000"
  "L_ERRORCODE0" => "10001"
  "L_SHORTMESSAGE0" => "Internal Error"
  "L_LONGMESSAGE0" => "Internal Error"
  "L_SEVERITYCODE0" => "Error"

The parameters that I send :

'USER' => $username,
'PWD' => $password,
'SIGNATURE' => $signature,
'VERSION' => "204.0",
'METHOD' => 'DoExpressCheckoutPayment',
'TOKEN' => $token,
'PAYERID' => $payerid,
'PAYMENTREQUEST_0_AMT' => $price,
'PAYMENTREQUEST_0_ITEMAMT' => $price,
'PAYMENTREQUEST_0_PAYMENTACTION' => 'Sale',
'PAYMENTREQUEST_0_CURRENCYCODE' => 'EUR'

Do you have Any idea ?

Answer 1

I could solve that by creating a new buyer and merchant account at https://developer.paypal.com/developer/accounts both in the same country (and so using the same currency).

I updated the API credentials (username, password, signature) from the new merchant and payed with the new buyer account.