Integrating With Saasu
Saasu is a cloud-based accounting software generally used as a person's first ERP system as it is inexpensive and has limited multi-company support.
There is not much to recommend it.

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In terms of an API, instead of using a REST API, Saasu uses a COMA API in that it is occasionally unresponsive.
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Saasu API calls run on a 10 minute cycle to prevent the calls being blocked due to too many requests within a time frame.
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Saasu are renowned for randomly changing their API.
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The API has hard limits on the number of API calls made each day depending on the package. Typically, people are on 10000 calls a day.
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It is recommended that nothing too advanced is done, as the API is not stable at the best of times.
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There are a lot of specific connections, many of which are not reusable. A lot of customer specific code.

.wms can:
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download orders including carrier mapping and priority mapping
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upload orders. Only exact at this stage. Not including partial fulfilments.
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upload adjustments
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download receipt jobs
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upload receipt jobs.

All Saasu use the same credentials under support@thomax.com.
To add a customer's company file to ours, the company owner must be added as a user.
Login details are available in 1Password for Support.