You're right, I think I got complicated up there. What I was trying to do is look for an encryption, using VERHOEFF, RC4 and BASE64, which asks for Internal Taxes of my country ... but I already solved the VERHOEFF problem. What I would like is; generate a cipher using the RC4 algorithm, VBA language. In such a way as to satisfy the following examples:

example1.
message: yK5K
key: pPgiFS%)v}@N4W3 aQqqXCEHVS2[aDw_n%3)pFyU%bE B9)YXt%xNBub4@P Z4S9)ct21885...

Excuse me, I speak Spanish. I am self-taught in computer science and I ventured to make a payment system for my small shop. the problem is; that for my billing system to work the algorithms are missing: presumed rc4, verhoeff and base64, in VBA language, I don't understand this and I wanted to ask if you had any of this among your algorithms that you could share with me, I am very grateful.

The algorithms must satisfy the result of...