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Stephanie BoccuzziStephanie Boccuzzi 

upload file to dropbox failed

We have had hired outside consultant did the integration for us to upload files to dropbox using dropbox API.
It has been working great for 4 months. all the sudden yesterday afternoon, it stopped working. It returns an error v1_retired, with code 400.
I suspect that the consultant has changed the user credential that has the access to the dropbox folder. the folder is shared to one of their email addresses.

They refused they did that and insist that we did something which we really didn't.
Can anyone help me to figure out? Obviously the consultant is no help.

Thanks!
Asif Ali MAsif Ali M
Seems like your integrations are using Dropbox API v1 which is now deprectaed and you need to change your integrations to use v2 API.
https://www.dropboxforum.com/t5/API-support/Regarding-API-V1-deprecation/td-p/228837
https://www.dropbox.com/developers/reference/migration-guide

 
Asif Ali MAsif Ali M
More info on Timelines
June 28, 2016: API v1 is deprecated.
September 28, 2016: If you haven’t acknowledged the deprecation, new users of your app will see a warning when linking their Dropbox account.
June 28, 2017: If you haven’t acknowledged the deprecation, all users who have linked their Dropbox account to your app will receive a warning email.
September 28, 2017: API v1 endpoints are turned off.