Use the value of a field to adjust the user's balance (myCRED and Gravity Forms)

Hello!
I would like to use the value entered for admin in a text field in a form editor to adjust the users balance.

To apply custom points of custom types of points, I thought of using CSS class to distinguish fields which adds points to a particular type of points.

Please do not laugh, this is a bit of what I am researching to create this plugin:

<?php

			add_action( 'gform_after_update_entry', array( $this, 'adjust_amount_field' ), 10, 2 );
			function adjust_amount_field( $form, $lead, $field, $value ) {

			// Requiremetns
	        if ( $form_id = $entry['id'] || ! current_user_can( 'edit_users' ) ) return;

			$field_class = explode(' ', $field['cssClass']);
			$field_class_matches = array_intersect($field_class, array('points-type-A'));

			$field_class = explode(' ', $field['cssClass']);
			$field_class_matches = array_intersect($field_class, array('points-type-B'));

		    // Get the user object
	        $user = get_userdata( absint( $lead['created_by'] ) );
	        if ( ! isset( $user->ID ) ) return;

			// Get Field Value
			add_filter("gform_get_field_value", "get_field_value", 10, 3);

			function get_field_value($value, $lead, $field){

    		//Aply Field Value in Amount adjust
			//?????????????????????????????????

    		if(is_array($value)){

        	foreach($value as $key => $input_value){

            $value[$key] = mycred_amount($input_value);

}

        	return $amount = sanitize_text_field( $value );

}
				// mycred = Amount override
				if ( $field['label'] || ! $field_class['points-type-A'] == 'points-type-A_amount' ) {
				$amount = sanitize_text_field( $field = $value );
				}

				if ( $field['label'] || ! $field_class['points-type-B'] == 'points-type-B_amount' ) {
				$amount = sanitize_text_field( $field = $value );
				}

				// Override entry at Lead ID
				if ( $field['label'] == 'mycred_entry' ) {
				$entry = sanitize_text_field( $field = $lead['id'] );
			}
		}
	}
?>

The idea is:

1 – Admin creates text field visible only to admins (“Points”). Field with class “points-type-A” add points to “points-type-A” custom point type;

2 – While reading a message, admin can adjust the score of the user filling out the value in the text field “Points” and updating the entry;

Images to illustrate,
A – Create form:
http://www.starsclubbrasil.com.br/up/sites/163/Captura-de-Tela-2014-06-13-%C3%A0s-00.57.54.png

B- Adjust Balance:
http://www.starsclubbrasil.com.br/up/sites/163/Captura-de-Tela-2014-06-13-%C3%A0s-00.57.54.png

Thanks since right now!

https://wordpress.org/plugins/mycred/