@ Steve H. Jeff Greenberg makes a good point; that being, "Stated interest rate payment" is a loan, not a security.
The key, as to whether or not you are violating SEC rules, is not simple. For example, you are not doing a "general solicitation or advertising to market the securities" if you have developed a relationship with a lender/investor.
There are also some limited exemptions available under Regulation D. Raising capital by issuing any security is a complicated web of securities regulations. To make matters even worse, you must comply with the requirements of the State, in every State where an investor resides.
Most businesses that issue securities file based on federal exemption Regulation D which consists of Rules 504, 505, and 506. I am not an attorney, and am working with an SEC attorney currently, that is the only reason I have this much (limited) knowledge.
The bottom line is, I would recommend that you, at the very least, consult with a qualified, knowledgable attorney before making a costly mistake.