How do I integrate PayPal Payments Standard with Magento 2.0?

Here's how:

  1. Log in to your Magento admin panel.
  2. Click Stores.
  3. Click Configuration.
  4. Click Sales.
  5. Click Payment Methods.
  6. Click Configure for PayPal Payments Standard.
  7. Configure the following settings to complete your PayPal Payments Standard integration:
    • Email Associated with PayPal Merchant Account - Enter your PayPal email address.
    • API Authentication Methods - Select API Signature.
    • API Username - Paste in your API username.
    • API Password - Paste in your API password.
    • API Signature - Paste in your API Signature.
    • Sandbox Mode - Select No unless you're using PayPal Sandbox credentials.
    • Enable this Solution - Select Yes.
    • Enable PayPal Credit - Select Yes.
    • Title - Enter your title as you would like it to appear.
    • Payment Action - Select either Sale or Authorize.
    • Display on Product Details Page - Select Yes (recommended).
    • Display on Shopping Cart - Select Yes.
    • Payment Applicable From - Select All Allowed Countries unless you intend to restrict locations.
    • Transfer Cart Line Items - Select Yes.
    • Enable PayPal Guest Checkout - Select Yes (recommended).
    • Review additional options not covered.
  8. Click Save Config.

See also:
Magento 1 End of Life Announcement
Magento 1 End of Life Partners
Magento User Guide "How To"
Magento 2 Developer Documentation