Random PKCE code verifier: 32 random bytes → 43-char base64url string (RFC 7636 requires 43-128 chars from the unreserved charset; base64url output is a strict subset of it).
Random PKCE code verifier: 32 random bytes → 43-char base64url string (RFC 7636 requires 43-128 chars from the unreserved charset; base64url output is a strict subset of it).