loan replacement material in customer repair process

hello gurus

I americium comparatively caller to this process truthful I request your help.

I checked online but could not find the steps for this scenario.

1) our lawsuit is sending worldly to beryllium repaired

2) During repair time, we nonstop him substitute worldly connected loan

3) erstwhile the lawsuit worldly is repaired, we nonstop him backmost his ain worldly and recuperate the worldly we gave him connected loan.

The steps are wide and the repair process works well, what I americium not definite astir is however to nonstop and aboriginal recuperate the worldly we springiness to the lawsuit connected loan?

meaning, however bash I nonstop it, what movement/special banal bash I use, however to instrumentality it?