where payload is a JSON base64-encoded string that accepts a list of objects that must contain:
echo -n '[ {"date": "2024-1-1", "name": "BUENOS AIRES, ARGENTINA"}, {"date": "2024-1-2", "name": "CHAD"}, {"date": "2024-1-3", "name": "COLOMBO, SRI LANKA"}, {"date": "2024-1-4", "name": "KYOTO, JAPAN"} ]' | base64 WwogIHsiZGF0ZSI6ICIyMDI0LTEtMSIsICJuYW1lIjogIkJVRU5PUyBBSVJFUywgQVJHRU5USU5BIn0sCiAgeyJkYXRlIjogIjIwMjQtMS0yIiwgIm5hbWUiOiAiQ0hBRCJ9LAogIHsiZGF0ZSI6ICIyMDI0LTEtMyIsICJuYW1lIjogIkNPTE9NQk8sIFNSSSBMQU5LQSJ9LAogIHsiZGF0ZSI6ICIyMDI0LTEtNCIsICJuYW1lIjogIktZT1RPLCBKQVBBTiJ9Cl0=
echo -n '[ {"date": "2024-1-1", "coords": [-34.61, -58.38]}, {"date": "2024-1-2", "coords": [12.11, 15.03]}, {"date": "2024-1-3", "coords": [6.93, 79.85]}, {"date": "2024-1-4", "coords": [35.01, 135.76]} ]' | base64 WwogIHsiZGF0ZSI6ICIyMDI0LTEtMSIsICJjb29yZHMiOiBbLTM0LjYxLCAtNTguMzhdfSwKICB7ImRhdGUiOiAiMjAyNC0xLTIiLCAiY29vcmRzIjogWzEyLjExLCAxNS4wM119LAogIHsiZGF0ZSI6ICIyMDI0LTEtMyIsICJjb29yZHMiOiBbNi45MywgNzkuODVdfSwKICB7ImRhdGUiOiAiMjAyNC0xLTQiLCAiY29vcmRzIjogWzM1LjAxLCAxMzUuNzZdfQpd