I have the same error on Sandbox account. I use DirectPayment with this sdk: https://github.com/paypal/merchant-sdk-php/tree/master/samples/DirectPayment My account is Paypal pro. Previously API calls were working fine, I was able to checkout successfully. But from July 2021 I get this Error. [ShortMessage] => Internal Error [LongMessage] => Internal Error [ErrorCode] => 10001
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