Credit Limit Configuration:
This section enables the admin to allow the customers to pay for products via Credit Limit Amount. In order to do so the steps are as follows:
In the admin panel from the left navigation bar click on the Stores ->Configuration

The admin would be redirected to the Configuration page:
1. Go to the Sales->Payment Methods
2. Go to the pay by Credit Amount Section.
3. The Credit Amount section consists of following fields which are as follows:

 a. Enabled: The admin can select as Yes or No based on his requirement, whether he wants the customer to pay for the product via credit cart amount.
b. Title: This admin needs to enter the amount that he wants to show for payment via Credit Limit.
c. New Order Status: The admin can select what status should be shown for the new order placed via Credit Limit.
 There is 3  status :
i. Pending: If the admin has chosen the state as Pending, then on placing the order the customer could able to credit the pay the credit amount to the admin. 
ii. Processing: If the admin has chosen the state as Processing, then on placing the order the customer could not able to credit the purchasing product to the admin. Along with that, the customer would be credited the purchased amount and the order would be in the Invoiced state.
 Order Placed by Credit Limit: If the admin has chosen the state as Order Placed by Credit Limit, then on placing the order the customer could able to credit the pending amount to the admin. 
Once, the admin has selected the settings as per his requirement he just needs to clicks on the Save Config button. Once, the admin clicks on the Save Config button, he would be getting a success message as You saved the Configuration.