To earn a purchasing certification, consult the American Purchasing Society, or APS, or the American Production and Inventory Control Society, or APICS, for particular program requirements. If you do not have a bachelor's degree in business, engineering or economics, you must have work-related experience to be eligible for certification. If you do have a bachelor's degree, choose a type of certification offered from APS or APICS, or become certified in public-sector purchasing through the Universal Public Procurement Certification Council.
There are different levels of certification based on the job or industry pursued. APS has the certified professional purchasing consultant certification, while the APICS offers the certified supply chain professional program for degree holders who are pursuing management level careers. For those without a degree, the Institute for Supply Management, or ISM, provides a program called the certified professional in supply management for candidates with at least five years of work-related experience. The ISM also offers the certified professional in supplier diversity program for degreed individuals with at least three years of experience. Many times these organizations also require a junior-level certification as a prerequisite.
The National Institute for Government Purchasing offers coursework for public-sector purchasing certification. Some certifications offered in this vein are the certified public procurement officer and the certified professional public buyer. Both require extensive work-experience and training as well as a formal degree.