Follow below mentioned steps for change in Magento Core API.
- Login Magento Admin
- Click on System and select Configuration option.
- Select Magento Core API on the left side of the Configuration Panel, under Services section.
- Tap on to expand the General Settings section and you can
- Type the name of the Default Response Charset that you want to use.
- Determine the Client Session Timeout in seconds.
- Click the Save Config button once you all done all the changes.
