1. From Marketing and Communications, click Acknowledgements
  2. Highlight the letter, click Edit
  3. Click Edit in the content editor to edit the letter
  4. In the merge fields drop down list, click More fields
  5. Expand Revenue Marketing>Revenue>Sales Order>Sales Order Payment>Revenue>Application Details>Amount
Note: In the last pop up screen, you may want to filter on the application of Membership 
  1. Click Save
  2. Click Merge Fields
  3. Insert Amount