The error 500 from MYOB is an internal MYOB error and needs to be investigated by SPS. You may see error logs similar to the ones below. We have seen to possible answers from MYOB, also outlined below.

29-May-2019 01:20:56 : Failed to get the online retailer data.

29-May-2019 01:22:47 : An error has occurred in 'Getting Customer' - 'Response status code does not indicate success: 500 (Internal Server Error).'

29-May-2019 01:22:47 : An error has occurred in 'Importing Order' - 'Response status code does not indicate success: 500 (Internal Server Error).'

29-May-2019 01:22:47 : Error #1 importing Order Number '000002249575X265'. Response status code does not indicate success: 500 (Internal Server Error).

29-May-2019 01:22:48 : Importing order 1 of 1. Order Number '000002249575X265'

29-May-2019 01:22:48 : Getting Customer 'xxxxxxx'

29-May-2019 01:22:48 : An error has occurred in 'Getting 

Possible Cause 1 - Not enough MYOB sessions allocated by MYOB

You need to get MYOB have investigated this issue, based off their recommendations, you have to requested that MYOB increase the allowed sessions for the API User.

Possible Cause 2 - The API user has exceeded usages

You do not have enough API user licenses allocated in your system, you will need to speak to MYOB regarding this

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