When I called RetrieveCatalogObject with the object_id OHET4DNO27UOD6BJSFL5K45X I got the image_url in the response. It’s in the item_data. 
{
"object": {
"type": "ITEM",
"id": "OHET4DNO27UOD6BJSFL5K45X",
"updated_at": "2023-07-20T22:14:55.362Z",
"created_at": "2023-06-27T21:47:02.934Z",
"version": 1689891295362,
"is_deleted": false,
"present_at_all_locations": true,
"item_data": {
"name": "Coffee Vanilla",
"description": "Good Coffee",
"is_taxable": true,
"visibility": "PRIVATE",
"category_id": "XT7DK4WDEVDFSWQZE4MJO3PD",
"tax_ids": [
"657YFPKJD2HHGNFF54ORAASP",
"36RFD4NUKE4DKGO5U7ANTAEE"
],
"modifier_list_info": [
{
"modifier_list_id": "77IKM6AQIA3IVMVQZVKVROCE",
"visibility": "PUBLIC",
"min_selected_modifiers": -1,
"max_selected_modifiers": -1,
"enabled": true
}
],
"image_url": "https://items-images-production.s3.us-west-2.amazonaws.com/files/2836c3fbd8185e7497b22204fe05afc9bfac52da/original.jpeg",
"variations": [
{
"type": "ITEM_VARIATION",
"id": "J7OW2DTXOO24E5FF2WN4YQ4K",
"updated_at": "2023-07-20T22:14:55.362Z",
"created_at": "2023-06-27T21:47:02.934Z",
"version": 1689891295362,
"is_deleted": false,
"present_at_all_locations": true,
"item_variation_data": {
"item_id": "OHET4DNO27UOD6BJSFL5K45X",
"name": "Small, Light Roast",
"ordinal": 0,
"pricing_type": "FIXED_PRICING",
"price_money": {
"amount": 200,
"currency": "USD"
},
"location_overrides": [
{
"location_id": "LTA744AZXNDS6",
"track_inventory": false
},
{
"location_id": "LWP0FBB28BSHZ",
"track_inventory": false
}
],
"track_inventory": false
}
},
{
"type": "ITEM_VARIATION",
"id": "6G6E4MGSTA3WGA5GETTSRSSO",
"updated_at": "2023-07-20T22:14:55.362Z",
"created_at": "2023-07-20T22:14:55.362Z",
"version": 1689891295362,
"is_deleted": false,
"present_at_all_locations": true,
"item_variation_data": {
"item_id": "OHET4DNO27UOD6BJSFL5K45X",
"name": "Small, Dark Roast",
"ordinal": 1,
"pricing_type": "VARIABLE_PRICING"
}
},
{
"type": "ITEM_VARIATION",
"id": "44VGQYGVJTE5M3LR4Z3TUZUE",
"updated_at": "2023-07-20T22:14:55.362Z",
"created_at": "2023-07-20T22:14:55.362Z",
"version": 1689891295362,
"is_deleted": false,
"present_at_all_locations": true,
"item_variation_data": {
"item_id": "OHET4DNO27UOD6BJSFL5K45X",
"name": "Small, Burned Roast",
"ordinal": 2,
"pricing_type": "VARIABLE_PRICING"
}
},
{
"type": "ITEM_VARIATION",
"id": "7ZYCRLZHYEYDR3ZIDRTWSXXH",
"updated_at": "2023-07-20T22:14:55.362Z",
"created_at": "2023-06-27T21:47:02.934Z",
"version": 1689891295362,
"is_deleted": false,
"present_at_all_locations": true,
"item_variation_data": {
"item_id": "OHET4DNO27UOD6BJSFL5K45X",
"name": "Medium, Light Roast",
"ordinal": 3,
"pricing_type": "FIXED_PRICING",
"price_money": {
"amount": 400,
"currency": "USD"
},
"location_overrides": [
{
"location_id": "LTA744AZXNDS6",
"track_inventory": false
},
{
"location_id": "LWP0FBB28BSHZ",
"track_inventory": false
}
],
"track_inventory": false
}
},
{
"type": "ITEM_VARIATION",
"id": "6ABX64EMP2D6DBYLNACVQI5K",
"updated_at": "2023-07-20T22:14:55.362Z",
"created_at": "2023-07-20T22:14:55.362Z",
"version": 1689891295362,
"is_deleted": false,
"present_at_all_locations": true,
"item_variation_data": {
"item_id": "OHET4DNO27UOD6BJSFL5K45X",
"name": "Medium, Dark Roast",
"ordinal": 4,
"pricing_type": "VARIABLE_PRICING"
}
},
{
"type": "ITEM_VARIATION",
"id": "QCSDAVKCY4U5M55SGRGCVHEB",
"updated_at": "2023-07-20T22:14:55.362Z",
"created_at": "2023-07-20T22:14:55.362Z",
"version": 1689891295362,
"is_deleted": false,
"present_at_all_locations": true,
"item_variation_data": {
"item_id": "OHET4DNO27UOD6BJSFL5K45X",
"name": "Medium, Burned Roast",
"ordinal": 5,
"pricing_type": "VARIABLE_PRICING"
}
},
{
"type": "ITEM_VARIATION",
"id": "CWLK7CHM6LNM6LNLHD6VOHWI",
"updated_at": "2023-07-20T22:14:55.362Z",
"created_at": "2023-06-27T21:47:02.934Z",
"version": 1689891295362,
"is_deleted": false,
"present_at_all_locations": true,
"item_variation_data": {
"item_id": "OHET4DNO27UOD6BJSFL5K45X",
"name": "Large, Light Roast",
"ordinal": 6,
"pricing_type": "FIXED_PRICING",
"price_money": {
"amount": 600,
"currency": "USD"
},
"location_overrides": [
{
"location_id": "LTA744AZXNDS6",
"track_inventory": false
},
{
"location_id": "LWP0FBB28BSHZ",
"track_inventory": false
}
],
"track_inventory": false
}
},
{
"type": "ITEM_VARIATION",
"id": "KQO5XKOKAPFEZBFHZ3ZI326B",
"updated_at": "2023-07-20T22:14:55.362Z",
"created_at": "2023-07-20T22:14:55.362Z",
"version": 1689891295362,
"is_deleted": false,
"present_at_all_locations": true,
"item_variation_data": {
"item_id": "OHET4DNO27UOD6BJSFL5K45X",
"name": "Large, Dark Roast",
"ordinal": 7,
"pricing_type": "VARIABLE_PRICING"
}
},
{
"type": "ITEM_VARIATION",
"id": "DKZNLYCWSWEXSHURYPONOYUO",
"updated_at": "2023-07-20T22:14:55.362Z",
"created_at": "2023-07-20T22:14:55.362Z",
"version": 1689891295362,
"is_deleted": false,
"present_at_all_locations": true,
"item_variation_data": {
"item_id": "OHET4DNO27UOD6BJSFL5K45X",
"name": "Large, Burned Roast",
"ordinal": 8,
"pricing_type": "VARIABLE_PRICING"
}
}
],
"product_type": "REGULAR",
"skip_modifier_screen": false,
"ecom_visibility": "UNINDEXED",
"pickup_fulfillment_preferences_id": "fprefs_127pcgy55a91aonps9gj705ms",
"delivery_fulfillment_preferences_id": "fprefs_127pcgy54xc03x63ey5oggex0"
}
}
}