QRcode API:
After Register(https://qrcodeapi.ir) you have a token key. so you can use free api.

Call API and Methods :

1) plaintext : https://qrcodeapi.ir/index.php?p=api&key=YOUR_TOKEN&ext=png&size=5&content=Hello World

2) url :       https://qrcodeapi.ir/index.php?p=api&key=YOUR_TOKEN&ext=png&size=5&content=https://google.com

3) tel :       https://qrcodeapi.ir/index.php?p=api&key=YOUR_TOKEN&ext=png&size=5&type=tel&content=98933xxxxxx

4) sms :       https://qrcodeapi.ir/index.php?p=api&key=YOUR_TOKEN&ext=png&size=5&type=sms&content=98933xxxxxx

5) email :     https://qrcodeapi.ir/index.php?p=api&key=YOUR_TOKEN&ext=png&size=5&type=email&content=email@domain.com

YOUR_TOKEN : Please replace your token instead YOUR_TOKEN 
EXT : you can select png or jpg
SIZE : size is a number between 1 - 100
TYPE : Image output type (email,sms,tel OR empty)

If all thinks are ok you will have a json response.
You can see 2 item in json and you must download file from address. This file remove from server at 1 next hour.