Buffer
Look for your Buffer subscription document with the party that billed the purchase. For direct payments, start in Buffer; for App Store or Google Play purchases, use the relevant store. Buffer explicitly says it cannot provide receipts for purchases through those stores.
In your Buffer account, click the profile avatar and open Plans & Billing. Go to Invoices & Receipts. Select View beside the payment you need. Choose Download invoice for the invoice or Download receipt for the payment receipt.
Buffer invoices: download the document for the right payment →
Source for this section: Buffer
Hootsuite
Look to Hootsuite for its subscription invoice. Find documents for advertising billed directly by an advertising platform with that platform. Hootsuite Ads Terms distinguish these payments from Hootsuite fees. Managing ads in one tool does not mean every payment has the same supplier.
Sign in to the Hootsuite account holding the subscription. Account → Social accounts and teams → Plan and billing → Billing history. Compare the invoice period and amount with the payment you need. Print the invoice to PDF and open the saved file.
For Business and Enterprise, invoice requests and modifications go through your customer account manager. Contact them; the self-service route above applies to other plans.
Hootsuite invoices: find subscription and advertising documents separately →
Source for this section: Hootsuite · Billing · Hootsuite · Ads
Later
For Later subscriptions bought on desktop, the official help describes receipt downloads for the primary account owner. For iOS in-app purchases, Later directs you to Apple. Later's team cannot access receipts for those purchases.
On a computer, open app.later.com and choose Settings → Subscription. Go to Payment & Billing History and click Details. Find the receipt for the required date and click Download. Open the downloaded file and compare its visible details with the payment you are looking for.
Later receipts: ask the primary owner or look through Apple →
Source for this section: Later