Thank you for your interest in the Visa Developer program. From the context of your inquiry below, it looks like you would like to do business with Visa or are inquiring about becoming a Visa business partner. If so, please navigate to this Contact Us Form link if you would like to do business with Visa – https://usa.visa.com/Forms/contact-us-form.html
In particular, if you are interested in using Visa Direct, see the top few paragraphs that are shaded in yellow that discuss the requirements to use Visa Direct.
After having read the documentation, if you meet those requirements, then please click through the link in those paragraphs to the Visa Direct Program Implementation Questionnaire, fill it out, and submit to the email address listed on that form.