Update Other Entry on Submission

<?php
/**
 * Gravity Perks // Easy Passthrough // Update Other Entry on Submission
 * https://gravitywiz.com/documentation/gravity-forms-easy-passthrough/
 *
 * Instruction Video: https://www.loom.com/share/65fad5b264e640ab94dca058d6ba83f4
 *
 * Update a field value of an entry on Form A when Form B is submitted based on populated
 * Easy Passthrough token.
 *
 * This technique provides a secure way to allow users to modify specific information on a previous
 * entry without exposing an entry ID. Exposing the entry ID can be a security risk as it is highly
 * predictable, potentially allowing bad actors to act on entries that do not belong to them.
 *
 * Note: this is very similar to our [GPEP Edit Entry](https://gravitywiz.com/edit-gravity-forms-entries-on-the-front-end/)
 * snippet. The key difference is the GPEP Edit Entry snippet is intended to update entries using the
 * same form that they were submitted from, while this snippet is intended to provide a more surgical
 * approach, updating only specific values on the original entry based on the submission of a separate form.
 *
 * Instructions
 *
 * 1. Add a Hidden field to Form B that will be used to capture an Easy Passthrough token.
 *
 * 2. Configure an Easy Passthrough feed on Form B to map data from Form A.
 *
 * 3. In the "Map Entry Meta" section, map the "Easy Passthrough Token" from Form A to the
 *    field you've created to capture it on Form B.
 *
 * 4. Install and configure this snippet per the inline instructions.
 */

// Update "123" to the form ID that should trigger an update to the other form's entry.
add_action( 'gform_after_submission_123', function ( $entry, $form ) {
	// Update "4" to the ID of the field that is populated with the EP token.
	$token_field_id = 4;

	// Update "5" to the ID of the field that should be updated on the other form's entry.
	$target_field_id = 5;

	// Update "Canceled" to the value that should be updated on the other form's entry.
	$update_value = 'Canceled';

	$token        = $entry[ $token_field_id ];
	$source_entry = gp_easy_passthrough()->get_entry_for_token( $token );
	if ( $source_entry ) {
		$source_entry[ $target_field_id ] = $update_value;
		GFAPI::update_entry( $source_entry );
	}

}, 10, 2 );