How can I do an http-request with a post method to an API in Angular 9

This is the first time I'm trying to do that and I don't know exactly how to start, if someone can guide me that would be very help full. I'm trying to do a login and if I want it to work a I have to do an http request with a post method to the API and will return me the information I need, but when I tried said Error 404 with URL, I tried with Postman and said other error that I will let below . I'm not telling that someone have to do it for me, just need someone to tell how can I start.

• This is the API https://devapi.shocklogic.com/v1.0/:key/Users/login/
• To make the petition to this endpoint i have to send this token in the header Token Token-App': '7875d82ca05f8ba818011eb04a890c20cb44c52e'
• Also I need to send three params Key, Identifier of the person and Password

Error that Postman said:

{
"type": "error",
"message": "please make sure your meet the following field requirements",
"check": 0,
"passed": false,
"requirements": [
[
"Identifier",
{
"is_required": true,
"requires_value": true,
"min_length": 1,
"max_length": 150
}
],
[
"Password",
{
"is_required": true,
"requires_value": true,
"min_length": 1,
"max_length": 60
}
]
]
}

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