Alogrhythm issuing codes for digiseller

On the plati market service, the user buys a gift code from me, there are different denominations of gift codes, after payment he will have to redirect to the page where his unique code will be read with my link (see the attached file).
I need software in which there will be files with certain nominals (there will be only 20, 50, 100, 300), each file contains codes, and I will need to replenish these codes, depending on what denomination the buyer bought, the software will have to issue one of the codes that will be taken from the file, if there is no certain denomination, it will have to, for example, be able to add a code from one file with another to get the desired denomination, relatively speaking, if the file does not have a denomination of 300 then it will have to give 2 codes of 100 and 1 of 50. or you will need a code for 600 then also give two codes for 300 and so on.
I apologize if the TK turned out to be a little murky, I do not know exactly how to write down the entire TK that would be clear to everyone, I can give a login and password to the admin panel where there will be access to all API commands


API https://my.digiseller.com/inside/api_general.asp#s...