Cetec ERP Trick - API Documentation can be found in your instance by going to https://YOURCOMPANY.cetecerp.com/apioverview
Also, there is a special API for importing Quotes/Orders to the system, as that area touches so many different pieces (Quotes, Customers, Parts, etc). That URL is:
https://YOURCOMPANY.cetecerp.com/importjson/overview
Currently, the first 1000 API calls are free each month - this page has pricing information if you’d like more details: https://cetecerp.com/resources/services/#api-access