I want a single image for a book cover. Is it as simple as buying the one-time 4.99$ and then sending it to my editor? Are there any other legal processes i need to go through?
Please check the licensing terms - Adobe Stock Help | Common Questions
Use of images on book/e-book covers
Use of Stock images on book or e-book covers is allowed if the print run is fewer than 500,000 copies (Adobe Stock limit). Images showing models can't be used in a manner that the models could perceive as offensive. (For example, avoid using images with models on the cover of a steamy romance novel or a book about politics or religion, etc.)