Code #1

Observations

15 characters with the right amount of numbers for a passcode format.

Spoiler

Make a 3×5 grid

Read left from the upper right H

hst53magic532bm

40 characters, mostly numbers and a few letters in the high range.

Spoiler

Atbash numbers and letters

7465937393546594453454c4c4f43443734515f4

Make pairs

74 65 93 73 93 54 65 94 45 34 54 c4 c4 f4 34 43 73 45 15 f4

This is clearly hex. Ascii numbers in hex fall in the 30 to 39 range. Looking at the string we can see that it is reversed. Reverse it

4f 51 54 37 34 43 4f 4c 4c 45 43 54 49 56 45 39 37 39 56 47

Convert hex to Ascii

OQT74COLLECTIVE979VG

15 characters, we have enough letters for a prefix and suffix but way too many numbers

[hint]There is a keyword substitution in there[/hint]

Spoiler

Make a 5×3 grid

Read going left from the upper right G

gwh425015e595yr

The keyword should be read as 50 1 5 e. Then convert roman numerals to get live

gwh42live595yr