first make sure the patio is not flaking, scaling, or chipping off. You need a good flat surface and one that is stable. Use a good quality leveolor to level out the area.
Then use a mortor or thinset to set the pavers into place. Nothing different than setting bricks on a slab foundation.
The key is a good flat surface, one that is not flaking and one that is clean.
A good quality adheasive like thinset or mortar will do.
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