I will start analysis for the payment gateway development. For this analysis, I should need to know what requirements are required to create a payment gateway (for example: contracts, integrations, APIs, approvals, etc.)
In particular, 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 the Visa Direct 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.
First, you'll need to decide whether you want a “classic” payment gateway setup or a modern one. Classic payment gateways require you to apply for a direct merchant account. ... PayPal is a good example of a modern payment gateway, while Authorize.net is an example of a classic gateway....... 192.168.1.1