bin: The data you wish to encode
id: The variant of encoding to use, which can be one of the following constants. You'll need to reuse this value when decoding with sodium_base642bin.
SODIUM_BASE64_VARIANT_ORIGINAL = 1
SODIUM_BASE64_VARIANT_ORIGINAL_NO_PADDING = 3
SODIUM_BASE64_VARIANT_URLSAFE = 5
SODIUM_BASE64_VARIANT_URLSAFE_NO_PADDING = 7