Passing initial value to subscription Form

Passing initial value to subscription Form

Hello,

Before loading subscription form we are taking user basic information on another form and then we need to pass first_name, last_name and email to per-poulated in zoho subscription form. However, when we passing parameters in zoho subscription iframe URL it's not loading into subscription form.

&first_name=zarl&last_name=Mac&email=zarl_mac@gmail.com

Would anyone suggest what's wrong with this and how can I pass this information into zoho subscription?
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