Once you have chosen whether to use an API, an SDK, or both in your sales engineering process, you need to use them effectively to achieve your desired outcomes. To do this, it is important to understand your prospects' pain points, goals, and expectations and tailor your use of APIs and SDKs accordingly. Additionally, you should research and test the APIs and SDKs that you plan to use to make sure they are reliable, secure, compatible, and up to date. You should also prepare and practice your demos, prototypes, and proofs of concept so they are clear, relevant, and engaging. Furthermore, explain and demonstrate the value and benefits of using APIs and SDKs as well as how they can solve your prospects' problems and enhance their experience. Finally, provide support and guidance to your prospects on how to use APIs and SDKs as well as how to troubleshoot and optimize them. Ultimately, APIs and SDKs are powerful tools that can help you showcase your product or service persuasively so that your prospects will buy from you. By understanding the differences between them as well as the benefits and drawbacks of each option, then using them wisely in the sales engineering process, you can create a compelling presentation that delivers results.