Would love to build that what you have done, but somehow I have no success, the Overview works, so 1_solaredgetime is ok, no error and I get an output to it while testing on AWS

2_solaredgedetails I get errors, output is:
Response:
{
"errorType": "TypeError",
"errorMessage": "Cannot read property 'Payload' of undefined",
"trace": [
"TypeError: Cannot read property 'Payload' of undefined",
" at Runtime.exports.handler (/var/task/index.js:6:42)",
" at Runtime.handleOnce (/var/runtime/Runtime.js:66:25)"
]
}

3_iftttwebhook does not work as well with me, following errors:
Response:
{
"errorType": "TypeError",
"errorMessage": "Cannot read property 'Payload' of undefined",
"trace": [
"TypeError: Cannot read property 'Payload' of undefined",
" at Runtime.exports.handler (/var/task/index.js:10:30)",
" at Runtime.handleOnce (/var/runtime/Runtime.js:66:25)"
]
}

Do you have a hint for me what I am doing wrong? I guess 3 is not working because of 2.

Would appreciate your help... very much beginner here...

API Key from SolarEdge and Site Id I changed, and this seems to work because 1_solaredgetime works and brings back the following result:
Response:
{
"overview": {
"lastUpdateTime": "2020-08-11 11:48:23",
"lifeTimeData": {
"energy": 12473005,
"revenue": 623.5971
},
"lastYearData": {
"energy": 11816433
},
"lastMonthData": {
"energy": 655243
},
"lastDayData": {
"energy": 22985
},
"currentPower": {
"power": 3969
},
"measuredBy": "INVERTER"
}
}

https://monitoringapi.solaredge.com/site/XXX/currentPowerFlow?api_key=XXX

Rather than having to replace values in the code with your credentials and IFTTT URLs, these could be specified as Lambda environment variables. This would allow the code to be used without any modification.