Often a form will contain several generic fields that many respondents will answer in the same way. Rather than making users fill in these fields, which can be repetitive and time consuming, you can pre-populate them with the correct information so that, when users open the form, these fields will already be filled in. To do so, you will need the form’s URL and the variable names associated with the fields they want to fill in.
Field values can be passed into a form by appending them to the form’s URL using the following structure:
baseURL?variable1=value
Replace baseURL with the form’s URL, variable1 with the name attribute associated with the field to be filled in and value with the appropriate plan's ID value. To fill in multiple fields, insert the ampersand symbol (&) before any additional variables:
baseURL?variable1=value&variable2=value
For Example:
http://your_site_url/membership-setup-page/?subscription_plan=2The result of above example will be like – the plan with plan id value 2 will get selected.
