503 on HTTP POST (Create a new vendor receipt)

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tmeier
Posts: 8
Joined: Fri Aug 15, 2025 4:47 am

503 on HTTP POST (Create a new vendor receipt)

Post by tmeier » Wed Feb 25, 2026 9:28 pm

I'm creating vendor receipts via the API endpoint and often get 503 errors; i.e.

Code: Select all

Service unavailable - try again later or consider setting this node to retry automatically (in the node settings)
503 - "{\"success\":false,\"errors\":[{\"message\":\"Service Unavailable\",\"code\":503}],\"messages\":[],\"result\":[],\"resultInfo\":[]}"
A couple of questions:
  • Is there a rate limit for this endpoint that could lead to this error? If so what are the restrictions?
  • Does an API call count towards the license count; i.e. if all licenses are in use will an API call fail?
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SimproAPITeam
Posts: 831
Joined: Wed May 01, 2024 2:31 am

Re: 503 on HTTP POST (Create a new vendor receipt)

Post by SimproAPITeam » Tue Mar 10, 2026 12:00 am

Hi,
There is no rate limit on this endpoint, and the REST API does not have a license limit, so the 503 errors are not caused by hitting a limit.
A 503 typically indicates that the service is temporarily unavailable or unreachable.
Could you please raise a support ticket if it's still happening on your build?
Regards
Simpro API Team | Simpro Software Group
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