Ajiye lambar bibiya, in ba haka ba babu martani.

This is a very common Hausa pattern. When one noun is linked to another, the first noun often takes a linking form. So lamba becomes lambar before bibiya.

So:

• lamba = number
• lambar bibiya = tracking number

You can think of it roughly as number of tracking, although natural English says tracking number.

Here in means if. Yes, in many contexts you could also use idan. Both can introduce a conditional idea.

So these are very close in meaning:

• in ba haka ba
• idan ba haka ba

Both mean something like otherwise or if not. The version with in is especially common in short written instructions and fixed expressions.

Because Hausa often forms negation with a frame like ba ... ba around what is being negated. Here:

• haka = like that / so
• ba haka ba = not like that / not so

Then with in, the whole phrase in ba haka ba means if not so, which English usually expresses as otherwise.

Because babu already carries the meaning of negative existence. It means there is no, there are no, or there is not any.

So:

• babu martani = there is no response

Hausa does not need a separate verb equivalent to English is in this kind of structure.

Hausa does not use articles the same way English does. There is no direct everyday equivalent that works exactly like a/an and the in all cases. Instead, definiteness is often understood from context.

So lambar bibiya can be understood as the tracking number or a tracking number, depending on the situation. In an instruction like this, English usually says the tracking number because the intended number is already clear from context.