Merge branch 'next' into 'master'

.gitignore

.phive/phars.xml

ajax/createOrder.php

ajax/expressCheckout.php

ajax/getClientId.php

ajax/recurring/createBillingAgreement.php

ajax/recurring/getBillingAgreement.php

ajax/recurring/getBillingPlans.php

composer.json

phpstan-baseline.neon

phpstan.dist.neon

src/QUI/ERP/Payments/PayPal/Cron.php

src/QUI/ERP/Payments/PayPal/Events.php

src/QUI/ERP/Payments/PayPal/ExpressPaymentDisplay.php

src/QUI/ERP/Payments/PayPal/PayPalException.php

src/QUI/ERP/Payments/PayPal/PayPalSystemException.php

src/QUI/ERP/Payments/PayPal/Payment.php

src/QUI/ERP/Payments/PayPal/PaymentDisplay.php

src/QUI/ERP/Payments/PayPal/PaymentExpress.php

src/QUI/ERP/Payments/PayPal/Provider.php