For this, you would need to create a trial account on ManyRequests here.
Once you've activated your account, you'll be greeted with the onboarding and redirected to the ManyRequests dashboard.
On your upper right side, you'll see a Setup guide dropdown, to which you can easily go through and update all the information needed.
This includes the following:
Personalizing your Portal
Connect your Billing
Creating your Service
Performing a Test Order
You also have the option to Skip these and head over to testing.
Below is a step-by-step process on how to test the checkout flow using a dummy credit card:
To perform a test order, Go to Users and select Clients.
Click on the vertical three dots and select Impersonate (this will take you to the viewpoint of your client)
Prior to performing a test, please make sure to add in your Billing Information by heading over to Settings > Modules and Extensions Fill out the necessary information.
On your test client's dashboard, go to Services and Purchase a service
You will be redirected to the checkout page wherein it will state:
"Test Mode. As you are a trial user, your credit card will not be charged."
Scroll down and input the Information needed to for a test request
Click Next
Input Dummy Credit Card Details and hit Pay Now
You'll then be redirected to a Successful Payment Page
