In my experience, when working with APIs, especially for integrating with websites or internal corporate systems, it's often beneficial to explore a few different options before settling on one. If the "wolfSSL_X509_STORE_GetCerts" API isn't quite fitting the bill because it operates on a store rather than directly on a signature, you might want to explore third party api integration services. These services often provide a wider range of functionalities and might offer a solution that fits your needs more closely. Sometimes, the perfect solution isn't immediately obvious, but with a bit of experimentation and exploration, you can usually find something that works well for your specific use case.