Attach objects onto the curved shape

You can use a ‘glue to’ component to stick to the various facets of a curved surface. But if the ‘coin’ is larger than the individual faces you’ll get some gaps.
You could also embed the coins and intersect them with the sphere so that actually take on the shape of the sphere.
Here’s a basic Glue To component. With hidden geometry turned on you can see the faces.
GlueTo

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