Hi there,
Generally that should not occur, however may be possible if there was a temporary issue with communication between your site and PayPal, or some issue on the server. Since most sales go through without any issues though, that would suggest that all the configuration is correct!
Checking with the customer to see if the issue persisted would definitely be a good first step. Hopefully it was just a temporary issue that resolved itself.
I’d also recommend enabling the Debug Mode: Save to Log setting in order to capture any errors while we are looking into this (and disable it once things are sorted out):

Link to image: https://d.pr/i/wDopjP
Then, if the issue occurs again, you can check the Braintree log in the dropdown under WooCommerce > Status > Logs and share the log here so we can check it out.
Let us know how that goes!
Hi @kellymetal thank you very much for your response. Unfortunately the user didn’t come back to us on this one, however…we have had one more report of this. Again, lots of other sales going through without issue. I asked the user to refresh and this resolved the issue for them.
I’ve looked in our Braintree logs. Other than the successful transactions that are human readable there are just lots of request / response pairs that are base64 encoded. Given the log has users details in it I’m not able to share. Are these requests to load the initial form before payment?
Request
environment: production
uri: generate
data: Array
(
)
What should I be looking for in the responses after decoding them? Or will there be an explicit error line logged? or just a missing Response? If this is just a temporary timeout type issue, is there a way to configure the plugin to retry?
Hi @codebuddy
Since we will need to look at the logs related to the failed payment and might include sensitive information. Please contact us at WooCommerce.com > My Account > Support. You may need to create an account before you can access that page.
Please include a link to this forum thread, so that we can keep track of what’s already been done.
We will be able to help you further there.
Hi @tibetanitech – thanks for this, I’ve now raised a ticket over there.
Great! I’m going to mark this as resolved – if you have any further questions, you can start a new thread.