add payment files

core/json/Iden3PaymentRailsRequestV1.json

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+{
+  "EIP712Domain": [
+    {
+      "name": "name",
+      "type": "string"
+    },
+    {
+      "name": "version",
+      "type": "string"
+    },
+    {
+      "name": "chainId",
+      "type": "uint256"
+    },
+    {
+      "name":  "verifyingContract",
+      "type:": "address"
+    }
+  ],
+  "Iden3PaymentRailsRequestV1": [
+    {
+      "name": "expirationDate",
+      "type": "uint256"
+    },
+    {
+      "name": "metadata",
+      "type": "string"
+    },
+    {
+      "name": "nonce",
+      "type": "uint256"
+    },
+    {
+      "name": "recipient",
+      "type": "string"
+    },
+    {
+      "name": "value",
+      "type": "uint256"
+    }
+  ]
+}

core/jsonld/payment.jsonld

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+{
+  "@context": {
+    "@version": 1.1,
+    "@protected": true,
+    "id": "@id",
+    "type": "@type",
+    "Iden3PaymentRailsRequestV1": {
+      "@id": "https://schema.iden3.io/core/jsonld/payment.jsonld#Iden3PaymentRailsRequestV1",
+      "@context": {
+        "@protected": true,
+        "@propagate": true,
+        "@vocab": "https://schema.iden3.io/core/vocab/payment.md#",
+        "xsd": "http://www.w3.org/2001/XMLSchema#",
+        "nonce": {
+          "@id": "nonce",
+          "@type": "xsd:nonNegativeInteger"
+        },
+        "value": {
+          "@id": "value",
+          "@type": "xsd:nonNegativeInteger"
+        },
+        "recipient": {
+          "@id": "value",
+          "@type": "xsd:string"
+        },
+        "expirationDate": {
+          "@id": "expirationDate",
+          "@type": "xsd:dateTime"
+        },
+        "metadata": {
+          "@id": "metadata",
+          "@type": "xsd:string"
+        }
+      }
+    }
+  }
+}

core/vocab/payment.md

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+# recipient
+
+recipient of the payment
+
+```
+      "recipient": "0x1234567"
+```
+
+# value 
+
+amount to pay 
+
+```
+      "value": "1"
+```
+
+# nonce
+
+unique nonce
+
+```
+      "nonce": "1"
+```
+
+# metadata
+
+payment request metadata (optional)
+
+```
+      "metadata": "0x"
+```
+
+# expirationDate
+
+when payment request is expired (ISO string)
+
+```
+      "expirationDate": "ISO"
+```
+
+# proof 
+
+signature proof
+
+# example for universal resolver field didResolutionMetadata
+```json
+{
+  "@context": [
+    "https://schema.iden3.io/core/jsonld/payment.jsonld#Iden3PaymentRailsRequestV1",
+    "https://w3id.org/security/suites/eip712sig-2021/v1"
+  ],
+  "type": "Iden3PaymentRailsRequestV1",
+  "recipient": "0xaddress",
+  "value": "100",
+  "expirationDate": "ISO string",
+  "nonce": "25",
+  "metadata": "0x",
+  "proof": [
+    {
+      "type": "EthereumEip712Signature2021",
+      "proofPurpose": "assertionMethod",
+      "proofValue": "0xa05292e9874240c5c2bbdf5a8fefff870c9fc801bde823189fc013d8ce39c7e5431bf0585f01c7e191ea7bbb7110a22e018d7f3ea0ed81a5f6a3b7b828f70f2d1c",
+      "verificationMethod": "did:pkh:eip155:0:0x3e1cFE1b83E7C1CdB0c9558236c1f6C7B203C34e#blockchainAccountId",
+      "created": "2024-09-26T12:28:19.702580067Z",
+      "eip712": {
+        "types": "https://example.com/schemas/v1",
+        "primaryType": "IdentityState",
+        "domain": {
+          "name": "StateInfo",
+          "version": "1",
+          "chainId": "0x0",
+          "verifyingContract": "0x0000000000000000000000000000000000000000",
+          "salt": ""
+        }
+      }
+    }
+  ]
+}
+```