You can pre-populate (ie. fill in the values automatically) on the checkout for any of the following fields. Note that this flips the checkout into “one-time-use” user mode, and bypasses the password field.
customer_first_name customer_last_name customer_email customer_address1 customer_address2 customer_city customer_state customer_postal_code customer_country customer_phone shipping_first_name shipping_last_name shipping_address1 shipping_address2 shipping_city shipping_state shipping_postal_code shipping_country shipping_phone
You can switch the checkout into “one-time-use” user mode (which allows checkout without password) by passing in an empty value for any of the above fields. Something like
<input name="shipping_phone" value="." />
or…
http://yourdomain.foxycart. com/cart?name=blah&price=9.99&shipping_phone=%20
(%20 is a URL encoded space.)
For reference, %2b is the code for a URL-encoded plus-sign.