Step 1:

Search postman download and install postman on your pc

Step 2:

Let's take first line on sendMammy API(https://api-wa.chatdaddy.tech/docs/) page for example

In Postman, choose Get as action and input https://api-teams.chatdaddy.tech/oauth2/token as url

Step 3：

Click 'Authorization' and choose 'Bearer Token' as Type

Step 4:

Copy code from sendMammy API page

Then in Postman, click 'Body', paste codes, and choose 'raw', then 'JASON' as data format

Step 5:

Click 'Code' on the right hand

Choose whatever language you want from the list