Need a Zapier expert for build an application

I need you to develop an application which will run in zapier. I have 2 api one api validate user access through API-KEY another is remove image background through the POST api with header. The api will return binary image data need to parshe the data and send the image to the Dropbox another folder. The step is given below 1. fetch image file from Dropbox 2. filter image file jpg or png 3. "My Application" will get image from Dropbox and process through our Api 4. Upload the processed image into the Dropbox in different folder.