[Plugin: WordPress Simple Paypal Shopping Cart] add variation control in php

I’m working with the plugin WordPress Simple Paypal Shopping Cart.

I try to integrate the “add to cart button” in my single.php file with variation control.

with shortcodes it works like this :
[wp_cart:PRODUCT-NAME:price:PRODUCT-PRICE:var1[VARIATION-NAME|VARIATION1|VARIATION2|VARIATION3]:end]

so with shortcodes I can do that (choose the color of any product) :
[wp_cart:PRODUCT-NAME:price:PRODUCT-PRICE:var1[color|red|blue|yellow]:end]

but in my single.php file the plugin isn’t ready to use variation control with php.
<?php echo print_wp_cart_button_for_product(’product name’,price); ?>

I’ve tried the “do_shortcode” solution to execute a shortcode in my template file
<?php echo do_shortcode('[wp_cart:PRODUCT-NAME:price:PRODUCT-PRICE:var1[color|red|blue|yellow]:end]'); ?>

but it simply return [wp_cart:PRODUCT-NAME:price:PRODUCT-PRICE:var1[color|red|blue|yellow]:end]

How can I add variation control to any template file in php ?