What does it mean: "on your behalf"

That means longer, monthly collaboration with us or having us take care of your particular case. 

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If you don't want to speak directly with a number of Polish companies, you face problems in contact or speaking, you prefer to set up everything in one place,

       then ask us...we can do it on your behalf. We mediate in taking care of your affairs.

Example: We can gather and pass your documents to the accounting office, we can negotiate terms and prices with suppliers and vendors, we can prepare quotations from a few sources, we can pack your goods and organize transport.