接入顺序:

1. Get Access Token
   后端做，拿到服务的token

POST https://api.sandbox.paypal.com/v1/oauth2/token

header:{  "PayPal-Request-Id": "platform-1670382693555",  "Authorization": "Basic QVRz****************************************************************************************************************************************************************************************************************akE="}

body :{

grant_type=client_credentials

}

1. Create Order
   后端做，计算金额 生成orderId

POST https://api.sandbox.paypal.com/v2/checkout/orders

header:{  "PayPal-Request-Id": "platform-1670382693941",  "Content-Type": "application/json",  "cache-control": "no-cache",  "Authorization": "Bearer A21******************************************************************************************NPWQ"}

body:{  "intent": "CAPTURE",  "purchase_units": [    {      "reference_id": "PU1",      "description": "Camera Shop",      "invoice_id": "INV-CameraShop-1670382691590",      "custom_id": "CUST-CameraShop",      "amount": {        "currency_code": "USD",        "value": 300,        "breakdown": {          "item_total": {            "currency_code": "USD",            "value": 300          }        }      },      "items": [        {          "name": "DSLR Camera",          "description": "Black Camera - Digital SLR",          "sku": "sku01",          "unit_amount": {            "currency_code": "USD",            "value": 300          },          "quantity": "1",          "category": "PHYSICAL_GOODS"        }      ]    }  ]}

1. Order Details
   可选

GET https://api.sandbox.paypal.com/v2/checkout/orders/2LS61083EB930562C

header:{  "PayPal-Request-Id": "platform-1670382702710",  "Content-Type": "application/json",  "Authorization": "Bearer A21******************************************************************************************NPWQ"}

1. Patch Order
   前端做 用户授权

PATCH https://api.sandbox.paypal.com/v2/checkout/orders/2LS61083EB930562C

header: {  "PayPal-Request-Id": "platform-1670382703115",  "Content-Type": "application/json",  "Authorization": "Bearer A21******************************************************************************************NPWQ"}

body:[  {    "op": "replace",    "path": "/purchase_units/@reference_id=='PU1'/amount",    "value": {      "currency_code": "USD",      "value": 350,      "breakdown": {        "item_total": {          "currency_code": "USD",          "value": 300        },        "shipping": {          "currency_code": "USD",          "value": 20        },        "tax_total": {          "currency_code": "USD",          "value": 30        }      }    }  }]

1. Immediate Capture
   后端收钱

POST https://api.sandbox.paypal.com/v2/checkout/orders/2LS61083EB930562C/capture/

header:{  "PayPal-Request-Id": "platform-1670382706795",  "Content-Type": "application/json",  "Authorization": "Bearer A21******************************************************************************************NPWQ"}