I have the same issue. I am able to generate the onboarding URL using V2 API. When I go there using a Business sandbox account and click the "Agree and Connect" button, it just says "Something Went Wrong". The culprit is having "INVOICE_READ_WRITE" in "features". Looking at the network tab and it tries to POST to https://www.sandbox.paypal.com/bizsignup/flows/setup, but gets a 404! BTW, my url when doing this is https://www.sandbox.paypal.com/bizsignup/#/grantPermissions. When generating the onboarding link, this is my POST body to "/v2/customer/partner-referrals": body: {
operations: [
{
operation: "API_INTEGRATION",
api_integration_preference: {
rest_api_integration: {
integration_method: "PAYPAL",
integration_type: "THIRD_PARTY",
third_party_details: {
features: [
"PAYMENT",
"REFUND",
"INVOICE_READ_WRITE",
"ACCESS_MERCHANT_INFORMATION",
]
}
},
}
}
],
products: [
"EXPRESS_CHECKOUT"
],
legal_consents: [
{
type: "SHARE_DATA_CONSENT",
granted: true
}
]
}
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