1) a custom field to be added to my oscommerce create account page. The field must be added in a manner that is consistent with oscommerce conventions and standards. The new field must reflect in the customer confirmation email as well as on the Admin orders page.
3) I need my store prices to be correctly configured for included tax.
2) I have a pdf invoice contribution installed, that must be reconfigured according to the above changes.
More details via PMB.