To repeat what was posted earlier, Brazilian rain tree, Pithecolobium tortum, is listed with CITES, as Endangered. This means international trade in seeds, seedlings, cuttings or any part of the plant is illegal.
In country shipment is legal, it is only illegal if the seed or cuttings cross an international border.
So try to source material in your own country. In the USA you risk seizure and fines if you try to import Pithecolobium tortum.
It is relatively common in botanical gardens, most countries have existing material that can be used as propagation stock. In usa just shop Weigert's.