careful and responsible spending to ensure the maximum benefit and impact for the public. Regular monitoring and evaluation of the programs funded by taxpayer dollars is essential to ensure accountability and transparency. Additionally, clear guidelines and oversight mechanisms should be in place to prevent misuse or misappropriation of taxpayer funds.

certification by a Certifying Officer

According to Taxpayer Alliance it is one word.

You, taxpayer. =( You, taxpayer. =(

One can find more information on IRS Taxpayer Representation on the IRS website, in the section titled 'Taxpayer Rights'. In this section it describes the right one has as a taxpayer, including the right to representation.