forepay

Etymology
From.

Verb

 * 1)  To pay beforehand or in advance.
 * 2) * 1872, The Spirit of Missions - Volume 37 - Page 783:
 * The express charges were forepaid, and the box iron-bound. This last was a good precaution, for otherwise the box had gone to pieces long before reaching this point.

Noun

 * 1) Payment made in advance.