Donation Form Testing
After creating your donation form, you should test it to see what

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From Tools, Donation form designer, create a donation form and select select a payment configuration to test mode.
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To display the donation form on your website, copy its HTML and paste into a webpage on your content management system.
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Enter a donation on the webpage with the form using a test credit card number.
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Make adjustments as necessary.
For more information, see Donation Forms.