Populate textarea from querystring

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Here’s how I solved it, your mileage may vary. Note that all of the php listed should go in your template’s functions.php file.

Step 1) Tell WordPress about any custom query string parameters you’re looking for. Source

<?php
function add_query_vars_filter( $vars ){
  $vars[] = "my_query_string_parameter";
  return $vars;
}
add_filter( 'query_vars', 'add_query_vars_filter' );
?>

Step 2) Add an action to the ninja_forms_display_init hook that will run as the form is loaded. Then use get_query_var to get the query string value you’re looking for. Finally, pass that value the Ninja Forms api method update_field_value using the ninja_forms_loading global object.

<?php
function handle_http_query_string( $form_id ){
	global $ninja_forms_loading;
	$ninja_forms_loading->update_field_value( my_field_id, get_query_var('my_query_string_parameter'));
}

add_action( 'ninja_forms_display_init', 'handle_http_query_string' );
?>