Summarize the following:
In the U.S., you can only obtain an IDP through the American Automobile Association (AAA) or the American Automobile Touring Alliance (AATA). Either visit a AAA branch in person or apply to either organization by mail; you can only apply through AATA by mail. You don't need to be a member of either organization in order to get an IDP. Keep in mind you must already hold a valid driver's license in order to apply for an IDP. Be wary of scams that claim to offer IDPs. Only AAA and AATA are authorized by the U.S. State Department to issue IDPs. Locate your local AAA branch at https://www.aaa.com/office/locations/?office=CRCAIDP. If you apply through AATA, send your application to P.O. Box 24980, San Jose, CA 95154. In most countries, much like the U.S., you apply for an IDP through a national or state auto club. For example, if you live in Australia, you'd apply through your state's Australian Automobile Association-affiliated club, such as the Royal Automobile Club of Victoria. In some nations, such as the United Kingdom, national postal services issue IDPs. Search online to find the right procedures for your nation. Visit www.aaa.com or www.aataidp.com, or your national auto club's website, and download, print, and fill out the IDP application. Alternatively, visit your local auto club branch (or post office) and fill out the application in person. You'll need to provide your full name, home address, driver's license number, license issuing and expiration dates, date and location of birth, phone number, and email address. You must also indicate where and when you plan to travel. You'll need to include a few other documents with your application, along with a $20 fee (U.S., as of 2019). Required documents include 2 original color passport photos and a signed photocopy of the front and back of your driver's license. If you mail your application, enclose a check or money order for the application fee; you may also need to pay for shipping and handling. If you apply in person, acceptable forms of payment include check, money order, and credit or debit. Outside the U.S. fees vary, but they're generally the equivalent of $10 to $20 USD. If you applied in person, you'll likely receive your IDP immediately. If you mailed your application, expect to receive your IDP in 2 to 4 weeks. Delivery may take an additional 2 weeks if you've applied for an IDP in your home country but are currently located overseas. If you mailed your application and need it promptly, you can pay extra to have it expedited. Express delivery fees may total up to $85 (U.S.). Keep in mind you'll need to have your IDP in hand you before you can drive in Japan. Simply submitting the application is not enough. An IDP is valid for 1 year. If you plan on staying in Japan for more than a year, you'll need to obtain a Japanese driver's license.

Summary:
Obtain an IDP from AAA or AATA if you live in the United States. Get your IDP from an auto club or post office if you live outside the U.S. Provide your personal info and driver's license details. Submit passport photos, copies of your license, and the fee payment. Allow 2 to 4 weeks for processing if you mailed your application.