For pre-filling the matrix field via URL parameters, the Field code can be found under the Advanced properties.

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Advanced properties

For the matrix field, the row labels are considered attributes, while the column labels are considered values. So, for example, if you want to select Excellent for the Friendliness row, the URL parameter should be rate_customer_rep.Friendliness=Excellent

Based on the above, we can use the in URL parameters, as shown below.

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Pre-filled values for matrix field

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