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In official REST API guide Step 4. Define configurable product options, there are payload like below.

{ "option": { "attribute_id": "141", "label": "Size", "position": 0, "is_use_default": true, "values": [ { "value_index": 9 } ] } }

Other parameters I can understand, but what is the function of value_index?

The guide just said

The value assigned to the value_index must be unique within the system.

I have huge configurable products to create by the API, how can I make sure the value_index different in each creation?

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"Value_index" is the configurable attribute option Id, which you want to use for this product . Simply it is configurable attribute's option id.

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  • Thanks for your answer. Why the id not auto generate? I have to assign it every time? I have huge configurable products to create by the API, how can I make sure the value_index different in each creation? Commented Jan 11, 2018 at 8:43
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After a research, I found in Magento 1.9, the configurable product value_index is the configurable attribute option value, which could get by 

$configurableAttributes = $product->getTypeInstance(true)->getConfigurableAttributesAsArray($product); print_r($configurableAttributes);

In Magento 2, the configurable product value_index is the configurable attribute option value too.

But, when use the Magento2 API, after my test, we could give the value_index some unique integer, like child product id, it will work too. We do not necessarily need the configurable attribute option value in the value_index.

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