We are currently stuck on the payment page where we pay our immigration fees. There's a category for "Principal applicant" that we can pay for which I'm presuming is the spouse I'm sponsoring. However there is also another one that says "Spouse, common-law partner or conjugal partner". Do we need to pay both or am I misunderstanding something because it seems like it's the same thing. If someone could explain, it would be greatly appreciated so we don't spend more than we have to. 
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