As of my last update in January 2022, the DSM-5-TR does not contain a specific diagnostic entry for behaviors related to online shopping platforms like eBay. The DSM primarily focuses on diagnosing mental health disorders and conditions recognized within the field of psychiatry.

However, certain behaviors associated with excessive or compulsive buying could potentially be classified under existing categories, such as:

1. Impulse-Control Disorders Not Elsewhere Classified: This category includes disorders characterized by difficulties with impulse control that do not fit into other established categories. Excessive or compulsive buying behaviors might be considered within this category if they significantly impair functioning or cause distress to the individual.

2. Other Specified Obsessive-Compulsive and Related Disorders: This category encompasses disorders with symptoms similar to obsessive-compulsive disorder (OCD) but do not meet the full criteria for diagnosis. Excessive or compulsive buying behaviors, particularly those driven by obsessive thoughts or rituals, might be considered within this category.

It's important to note that while excessive or compulsive buying behavior can have negative impacts on an individual's life, it doesn't necessarily mean it qualifies as a mental disorder. Diagnosis should be made by a qualified mental health professional based on a comprehensive assessment of symptoms, duration, severity, and their impact on daily functioning.