In the form of goods and services rather than money.
In the era before the widespread monetization of transactions with currency, barter was the usual form of selling and buying for farmers, and payment of taxes was often in kind; that is, farmers' payment method was most often their produce itself.
How much did he give? – Hard to say. It was all in kind.
The pay is OK, but the real attraction is all the benefits in kind.
Adverb
With goods or services (as opposed to cash).
I made some donations to the charity, not in money, but in kind, such as non-perishable food.
In a reciprocal manner; in a similar way; in the same kind.