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 rows labels are considered as attributes while the columns labels are considered as values. So for example, if you want to select Excellent for the Friendliness row, the URL parameter would be: rate_customer_rep.Friendliness=Excellent

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

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Pre-filled values for matrix field

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