An example of a customized AppSumo Code Redeem page using PMPro Signup Shortcode.

appsumo-code-redeem-with-pmpro-signup-shortcode.php

<?php
/**
 * This recipe creates a customized easy signup and code redeem page
 * for AppSumo promotions.
 *
 * This recipe assumes the following:
 * PMPro Signup Shortcode is installed and active.
 * @link https://www.paidmembershipspro.com/add-ons/pmpro-signup-shortcode/
 *
 * You have a page with [pmpro_signup] shortcode and it is configured correctly.
 * You have a custom confirmation page to redirect to after the code was redeemed (optional)
 * The level for the AppSumo redeem code is level 3
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

/*
Suggested shorcode configuration, change "Redeem Now" for the submit button to suit your requirements.
If you would like to show a "Log In" link below the submit button
set change the login option from 0 to 1 in the shortcode,
e.g. login="1"

[pmpro_signup level="3" short="emailonly" hidelabels="true" submit_button="Redeem Now" custom_fields="true" login="0"]

 */

/* Hide "Confirm Password" field (Optional) */
add_filter( 'pmpro_checkout_confirm_password', '__return_false' );

/* Hide "Confirm E-mail Address" field (Optional) */
add_filter( 'pmpro_checkout_confirm_email', '__return_false' );

/**
 * Change the Discount Code text strings if a specific
 * level is specified as a querystring parameter in the URL.
 */

function my_pmpro_discount_code_text_strings_1610643091698( $translated_text, $text, $domain ) {

	// Dont change text if we're not on the level checkout for the AppSumo deal.
	if ( isset( $_REQUEST['level'] ) && 5 != $_REQUEST['level'] ) {
		return $translated_text;
	}
	// Do you have a discount code?
	// Click here to enter your discount code
	switch ( $translated_text ) {
		case 'Discount Code':
			$translated_text = __( 'AppSumo Code', 'paid-memberships-pro' );
			break;
		case 'Do you have a discount code?':
			$translated_text = __( 'Do you have an AppSumo redemption code?', 'paid-memberships-pro' );
			break;
		case 'Click here to enter your discount code':
			$translated_text = __( 'Click here to redeem your AppSumo code', 'paid-memberships-pro' );
			break;

	}
	return $translated_text;
}
add_filter( 'gettext', 'my_pmpro_discount_code_text_strings_1610643091698', 20, 3 );

/**
 * Creates custom fields for membership registration.
 *
 * @requires Register Helper Add On
 * @link https://www.paidmembershipspro.com/add-ons/pmpro-register-helper-add-checkout-and-profile-fields/
 */
function my_pmprorh_init_custom_registration_fields_1610524957() {
	// don't break if Register Helper is not loaded
	if ( ! function_exists( 'pmprorh_add_registration_field' ) ) {
		return false;
	}

	// define the fields
	$fields = array();
	// TEXT FIELD
	$fields[] = new PMProRH_Field(
		'first_name', // input field name, used as meta key
		'text',         // field type
		array(
			'label'           => 'First Name', // display custom label, if not used field name will be used
			'html_attributes' => array(
				'placeholder' => 'First Name',
				'required'    => 'required',
			),
			'levels'          => array( 3 ), // levels to display field for
			'class'           => 'first_name', // custom class for input field
			'profile'         => true, // show on profile
			'memberslistcsv'  => true, // include when using export members to csv
			'addmember'       => true, // include when using add member from admin
			'required'        => true, // make field required
			'save_function'   => 'save_first_and_last_name_1610524713986',
		)
	);
	$fields[] = new PMProRH_Field(
		'last_name', // input field name, used as meta key
		'text',         // field type
		array(
			'label'           => 'Last Name', // display custom label, if not used field name will be used
			'html_attributes' => array(
				'placeholder' => 'Last Name',
				'required'    => 'required',
			),
			'levels'          => array( 3 ), // levels to display field for
			'class'           => 'last_name', // custom class for input field
			'profile'         => true, // show on profile
			'memberslistcsv'  => true, // include when using export members to csv
			'addmember'       => true, // include when using add member from admin
			'required'        => true, // make field required
			'save_function'   => 'save_first_and_last_name_1610524713986',
		)
	);
	$fields[] = new PMProRH_Field(
		'discount_code', // input field name, used as meta key
		'text',         // field type
		array(
			'label'           => 'Redeem code', // display custom label, if not used field name will be used
			'html_attributes' => array(
				'placeholder' => 'Redeem code',
				'required'    => 'required',
			),
			'levels'          => array( 3 ), // levels to display field for
			'class'           => 'discount_code', // custom class for input field
			'memberslistcsv'  => true, // include when using export members to csv
			'addmember'       => true, // include when using add member from admin
			'required'        => true, // make field required
		)
	);

	foreach ( $fields as $field ) {
		pmprorh_add_registration_field(
			'after_email', // location on checkout page
			$field     // PMProRH_Field object
		);
	}
	unset( $field );

	// that's it. see the PMPro Register Helper readme for more information and examples.
}
add_action( 'init', 'my_pmprorh_init_custom_registration_fields_1610524957' );


function save_first_and_last_name_1610524713986( $user_id ) {
	global $current_user;

	if ( ! empty( $_REQUEST['first_name'] ) ) {
		$first_name = trim( sanitize_text_field( $_REQUEST['first_name'] ) );
	} elseif ( ! empty( $_SESSION['first_name'] ) ) {
		$first_name = trim( sanitize_text_field( $_SESSION['first_name'] ) );
	} elseif ( is_user_logged_in() ) {
		$first_name = $current_user->first_name;
	} else {
		$first_name = '';
	}

	if ( ! empty( $_REQUEST['last_name'] ) ) {
		$last_name = trim( sanitize_text_field( $_REQUEST['last_name'] ) );
	} elseif ( ! empty( $_SESSION['last_name'] ) ) {
		$last_name = trim( sanitize_text_field( $_SESSION['last_name'] ) );
	} elseif ( is_user_logged_in() ) {
		$last_name = $current_user->last_name;
	} else {
		$last_name = '';
	}

	update_user_meta( $user_id, 'first_name', $first_name );
	update_user_meta( $user_id, 'last_name', $last_name );
	update_post_meta( $user_id, 'billing_name', $first_name . ' ' . $last_name );
}
add_action( 'pmpro_after_checkout', 'save_first_and_last_name_1610524713986' );

/*
 * Redirect members to a custom confirmation page after checkout
 * for a specific level.
 *
 * Remove or disable this to redirect to the default PMPro Confirmation page
 * after checkout.
 */

function my_pmpro_confirmation_url_per_post_slug( $rurl, $user_id, $pmpro_level ) {

	$page_id  = 136; //change this to your custom confirmation page ID
	$page_url = get_permalink( $page_id );

	if ( $page_url && 3 == $pmpro_level->id ) {
		$rurl = $page_url;
	}

	return $rurl;
}
add_filter( 'pmpro_confirmation_url', 'my_pmpro_confirmation_url_per_post_slug', 10, 3 );