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In order to get list of vendors perform /V1/udapi/vendors GET API call. It expect searchCriteria
as parameter. More details on how to construct the filter check can be found here http://devdocs.magento.com/guides/v2.1/rest/performing-searches.html
In order to get single Vendor information perform /V1/udapi/vendor/info/:id GET API call. :id parameter could be either vendor entity id or his name.
In order to get list of vendors products perform /V1/udapi/products/:id GET API call. :id parameter could be either vendor entity id or his name. It expect searchCriteria
as parameter. More details on how to construct the filter check can be found here http://devdocs.magento.com/guides/v2.1/rest/performing-searches.html
In order to get offers from multiple vendors perform /V1/udapi/vendor/product-offers/:sku GET API call. :sku parameter should be product's sku.
In order to get product questions to vendorsperform /V1/udapi/vendor/product-questions/:sku GET API call. :sku parameter should be product's sku.
In order to create new question to vendors perform /V1/udapi/vendor/product-question-ask/:id/:sku POST API call. :id parameter could be either vendor entity id or his name. :sku parameter should be product's sku. Other parameters are: name - customer name, question - question text, visibility - 0 / Private or 1 / Public