Simple WordPress shortcode that allows users to convert their myCRED Points into MarketPress Coupons. Version 1.1 requires myCRED 1.4 or higher.

myCRED to MarketPress Coupon

/**
 * Convert myCRED Points into MarketPress Coupon
 * @version 1.1
 */
add_shortcode( 'mycred_to_mpress_coupon', 'mycred_pro_render_points_to_marketpress_coupon' );
function mycred_pro_render_points_to_marketpress_coupon( $atts, $content = NULL ) {
	// Users must be logged in
	if ( ! is_user_logged_in() )
		return 'You must be logged in to generate store coupons.';

	// myCRED must be enabled
	if ( ! function_exists( 'mycred' ) )
		return 'myCRED must be enabled to use this shortcode';

	extract( shortcode_atts( array(
		'exchange'     => 1,
		'type'         => 'mycred_default',
		'button_label' => 'Create Coupon'
	), $atts ) );

	// Load myCRED
	$mycred = mycred( $type );

	// Prep
	$error = $code = false;
	$output = '';
	$user_id = get_current_user_id();

	// No need to show this for excluded users
	if ( $mycred->exclude_user( $user_id ) ) return;

	$balance = $mycred->get_users_balance( $user_id, $type );

	// Form submission
	if ( isset( $_POST['mycred_to_mark'] ) && wp_verify_nonce( $_POST['mycred_to_mark']['token'], 'points-to-market-coupon' ) ) {

		// Make sure amounts are always positive
		$amount = abs( $_POST['mycred_to_mark']['amount'] );
		
		// Exchange
		$cost = round( $amount * $exchange );

		// Make sure amount is not zero
		if ( $amount == $mycred->zero() )
			$error = 'Amount can not be zero';

		// Make sure user has enough points
		if ( $cost > $balance )
			$error = 'Insufficient Funds. Please try a lower amount';

		// If no errors
		if ( $error === false ) {

			// In this example coupons are valid for 30 days
			// You can change this to a specific date or change
			// the number of days. We need a unix timestamp.
			$expires = strtotime( '+ 30 days' );

			// In this exmaple we will want users to be able to use
			// the generated coupon right away but you can change thi
			// to any unix timestamp as long as it is befor the expire date.
			$start = time();

			// Create MarketPress Coupon
			$code = wp_generate_password( 12, false, false );
			$code = strtoupper( $code );
			$coupon = array(
				'discount_type' => 'amt',
				'discount'      => $cost,
				'start'         => $start,
				'end'           => $expires,
				'uses'          => 1
			);
			
			// Save
			$coupons = get_option( 'mp_coupons', array() );
			$coupons[ $code ] = $coupon;
			update_option( 'mp_coupons', $coupons );

			// Deduct points from user
			$mycred->add_creds(
				'points_to_coupon',
				$user_id,
				0-$cost,
				'%plural% conversion into store coupon',
				$new_coupon_id,
				array( 'code' => $code ),
				$type
			);

			$balance = $balance-$cost;
			$balance = $mycred->number( $balance );
		}

	}

	// Show users current balance
	$output .= '
<p>Your current balance is: ' . $mycred->format_creds( $balance ) . '</p>';

	// Error
	if ( $error !== false )
		$output .= '<p style="color:red;">' . $error . '</p>';

	// Success
	elseif ( $code !== false )
		$output .= '<p>Your coupon code is: <strong>' . $code . '</strong></p>';

	// The form for those who have points
	if ( $balance > $mycred->zero() )
		$output .= '
<form action="" method="post">
	<input type="hidden" name="mycred_to_mark[token]" value="' . wp_create_nonce( 'points-to-market-coupon' ) . '" />
	<label>Amount</label>
	<input type="text" size="5" name="mycred_to_mark[amount]" value="" />
	<input type="submit" name="submit" value="' . $button_label . '" />
</form>';

	// Not enough points
	else
		$output .= '<p>Not enough points to create coupons.</p>';

	return $output;
}