Who holds the power of purse with USDA's credit card?

During the Trump administration, the USDA under the direction of former Secretary Sonny Perdue, got creative with the credit line to dole out Market Facilitation Program (MFP) trade mitigation payments and Coronavirus Food Assistance Program payments under the Trump administration. The actions by the Trump administration's USDA empowered the current administration's USDA to creatively use the agency's CCC authority to circumvent Congressional input. This week Secretary of Agriculture Tom Vilsack announced that within the spending authority of the Commodity Credit Corporation, the agency had enough funds to not only pay for the normal farm bill programs which are normally paid out of the CCC, but also use CCC funds to increase USDA's commitment to climate-smart agriculture, nearly tripling the previously announced investment of $1 billion to $3.5 billion for new pilot projects. [Extracted from the article]