Automatically updates the cost of a membership level to be the local currency amount equivalent to a defined price in a different currency.

pmpro_convert_currency.php

<?php

// Copy from below here...

/**
 * Automatically updates the cost of a membership level to be the local currency amount
 * equivalent to a defined price in a different currency.
 *
 * For example, the default setup below will get the conversion rate from USD to ZAR
 * every day and use that information to set the membership price for level ID 5
 * to be equivalent to $25 USD in ZAR. Information about this conversion can be
 * displayed to the user using new variables in the PMPro Custom Level Cost Text Add On.
 * 
 * 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/
 */

/*
 * SETUP STEPS
 */
// Step 1: Go to https://free.currencyconverterapi.com and click "Get Your Free API Key".
// Step 2: Follow process to confirm email address and retrieve API key.
// Step 3: Enter API key below:
define( 'MY_PMPRO_CURRECNCYCONVERTER_API_KEY', 'XXXXXXXXXXXXXXXXXX' );

// Step 4: Create $my_pmpro_base_prices to set the "base prices" for your membership level.
global $my_pmpro_base_prices, $my_pmpro_currencyconverter_api_key;
$my_pmpro_base_prices = array(
	5 => array( // Update price for level ID 5.
		'currency'        => 'USD', // Currency that you would like to convert from.
		'initial_payment' => 25,    // Initial payment amount in base currency
		'billing_amount'  => 25     // Recurring payment amount in base currency.
	)
);
// Step 5: Run the code to update your prices by going to yoursite.com/wp-admin/?my_pmpro_update_currency_conversions=1.
// Step 6: Make sure that membership level prices were updated correctly.
// Step 7: (optional) Install PMPro Custom Level Cost Text add on and use new variables listed in my_pclct_variables_currency_conversions().

/*
 * HANDLE UPDATING CURRENCIES
 */
function my_pmpro_update_currency_conversions() {
	global $my_pmpro_base_prices, $my_pmpro_currencyconverter_api_key, $pmpro_currency;

	$conversion_rate_cache = array();
	foreach ( $my_pmpro_base_prices as $level_id => $base_price_data ) {
		$level = new PMPro_Membership_Level( $level_id );
		if ( empty( $level ) ) {
			// Invalid level ID.
			continue;
		}

		$base_price_data['currency'] = strtoupper( $base_price_data['currency'] );
		if ( ! isset( $conversion_rate_cache[ $base_price_data['currency'] ] ) && defined( 'MY_PMPRO_CURRECNCYCONVERTER_API_KEY' ) ) {
			// We have not yet checked this currency's conversion rate. Do it now.
			$args = array(
				'apiKey' => MY_PMPRO_CURRECNCYCONVERTER_API_KEY,
				'q'      => $base_price_data['currency'] . '_' . strtoupper( $pmpro_currency ),
			);
			$conversion_data_raw = wp_remote_get( add_query_arg( $args, 'https://free.currconv.com/api/v7/convert' ) );
			$conversion_data_body = json_decode( $conversion_data_raw['body'] );
			$conversion_rate = $conversion_data_body->results->{$args['q']}->val;
			$conversion_rate_cache[ $base_price_data['currency'] ] = $conversion_rate;
		}
		
		if ( empty( $conversion_rate_cache[ $base_price_data['currency'] ] ) ) {
			// Recieved an error from API call. Clear out old conversion rate.
			delete_pmpro_membership_level_meta( $level_id, 'conversion_rate' );
			continue;
		}
		$level->initial_payment = pmpro_round_price( $base_price_data['initial_payment'] * $conversion_rate_cache[ $base_price_data['currency'] ] );
		$level->billing_amount  = pmpro_round_price( $base_price_data['billing_amount'] * $conversion_rate_cache[ $base_price_data['currency'] ] );
		$level->save();

		update_pmpro_membership_level_meta( $level_id, 'conversion_rate', $conversion_rate_cache[ $base_price_data['currency'] ] );
	}
}
add_action( 'pmpro_cron_expire_memberships', 'my_pmpro_update_currency_conversions' );

function my_pmpro_update_currency_conversions_admin_init() {
	if ( isset( $_REQUEST['my_pmpro_update_currency_conversions'] ) ) {
		my_pmpro_update_currency_conversions();
	}
}
add_action( 'admin_init', 'my_pmpro_update_currency_conversions_admin_init' );

/*
 * INTEGRATE WITH PMPRO CUSTOM LEVEL COST TEXT
 */
function my_pclct_variables_currency_conversions( $search ) {
	$search[] = '!!site_currency!!';
	$search[] = '!!base_price!!';
	$search[] = '!!base_currency!!';
	$search[] = '!!conversion_rate!!';
	return $search;
}
add_filter( 'pclct_variables', 'my_pclct_variables_currency_conversions' );

function my_pclct_content_currency_conversions( $replace, $cost, $level ) {
	global $my_pmpro_base_prices, $pmpro_currency;
	$replace[] = $pmpro_currency;

	$initial_payment = $my_pmpro_base_prices[ $level->id ]['initial_payment'];
	$replace[] = empty( $initial_payment ) ? '???' : $initial_payment;

	$base_currency = $my_pmpro_base_prices[ $level->id ]['currency'];
	$replace[] = empty( $base_currency ) ? '???' : $base_currency;

	$conversion_rate = get_pmpro_membership_level_meta( $level->id, 'conversion_rate', true );
	$replace[] = empty( $conversion_rate ) ? '???' : $conversion_rate;
	return $replace;
}
add_filter( 'pclct_variables_content', 'my_pclct_content_currency_conversions', 10, 3 );