Hey Grace, auto-payout is tricky because there isn't an integrated way to do that within the Shopify platform. Our recommendation would be to use Stripe for affiliate payouts.
If you'd like to be a free beta tester of our Shopify affiliates app, please just shoot an email to email@example.com with any relevant details/requirements and any existing affiliate/payout platform you're utilizing. Thanks!
You can use an app like Refersion to give payouts to influencers, but you'll have to setup the payment details within the platform. In my experience, paying through Refersion was just a couple of clicks with a Paypal account.
If you're looking to scale up your influencer marketing, you should try the Carro app. It is free to use and helps you identify influencers that have interacted with your brand.