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1

Set your API key

Set the authentication headers:
2

Set your material name

This can be any name you like, but names must be unique within your MSI library.
3

Optionally set a code

Use this field if you have a unique material identifier from an external system.
4

Set the category

The category is required. This does not impact calculation but is used for classifying materials in the library.See MSI Get Material Categories for additional information.
5

Set the base materials

Each of your custom material in MSI contains reference(s) to the MSI base materials. These are referenced by a BaseMaterialId.See MSI Get Base Materials for additional information about how to retrieve a master list of base materials and their IDs.
6

Set blend percentages

For blends, simply include the percentage of each base material.