diff --git a/.gitignore b/.gitignore
index 1ce3235..1f3c41b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -58,4 +58,5 @@ yarn-error.log*
 .vscode
 .idea
 
-dist/
\ No newline at end of file
+dist/
+coverage/
\ No newline at end of file
diff --git a/jest.json b/jest.json
new file mode 100644
index 0000000..123373d
--- /dev/null
+++ b/jest.json
@@ -0,0 +1,31 @@
+{
+  "moduleFileExtensions": [
+    "ts",
+    "js",
+    "json"
+  ],
+  "transform": {
+    "^.+\\.ts$": "ts-jest"
+  },
+  "testEnvironment" : "node",
+  "testRegex": "/tests/.*\\.(test|spec)\\.(ts)$",
+  "testURL": "http://localhost/",
+  "coverageThreshold": {
+    "global": {
+      "statements": 90,
+      "branches": 90,
+      "functions": 90,
+      "lines": 90
+    }
+  },
+  "collectCoverageFrom": [
+    "src/**/*.ts",
+    "!**/node_modules/**",
+    "!**/vendor/**"
+  ],
+  "coverageReporters": [
+    "lcov",
+    "text"
+  ],
+  "verbose": true
+}
diff --git a/package-lock.json b/package-lock.json
index 8e15163..fb2f55e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,6 +13,103 @@
         "@babel/highlight": "^7.0.0"
       }
     },
+    "@babel/core": {
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.4.4.tgz",
+      "integrity": "sha512-lQgGX3FPRgbz2SKmhMtYgJvVzGZrmjaF4apZ2bLwofAKiSjxU0drPh4S/VasyYXwaTs+A1gvQ45BN8SQJzHsQQ==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/generator": "^7.4.4",
+        "@babel/helpers": "^7.4.4",
+        "@babel/parser": "^7.4.4",
+        "@babel/template": "^7.4.4",
+        "@babel/traverse": "^7.4.4",
+        "@babel/types": "^7.4.4",
+        "convert-source-map": "^1.1.0",
+        "debug": "^4.1.0",
+        "json5": "^2.1.0",
+        "lodash": "^4.17.11",
+        "resolve": "^1.3.2",
+        "semver": "^5.4.1",
+        "source-map": "^0.5.0"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.5.7",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+          "dev": true
+        }
+      }
+    },
+    "@babel/generator": {
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.4.4.tgz",
+      "integrity": "sha512-53UOLK6TVNqKxf7RUh8NE851EHRxOOeVXKbK2bivdb+iziMyk03Sr4eaE9OELCbyZAAafAKPDwF2TPUES5QbxQ==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.4.4",
+        "jsesc": "^2.5.1",
+        "lodash": "^4.17.11",
+        "source-map": "^0.5.0",
+        "trim-right": "^1.0.1"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.5.7",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+          "dev": true
+        }
+      }
+    },
+    "@babel/helper-function-name": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.1.0.tgz",
+      "integrity": "sha512-A95XEoCpb3TO+KZzJ4S/5uW5fNe26DjBGqf1o9ucyLyCmi1dXq/B3c8iaWTfBk3VvetUxl16e8tIrd5teOCfGw==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-get-function-arity": "^7.0.0",
+        "@babel/template": "^7.1.0",
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helper-get-function-arity": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0.tgz",
+      "integrity": "sha512-r2DbJeg4svYvt3HOS74U4eWKsUAMRH01Z1ds1zx8KNTPtpTL5JAsdFv8BNyOpVqdFhHkkRDIg5B4AsxmkjAlmQ==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helper-plugin-utils": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-plugin-utils/-/helper-plugin-utils-7.0.0.tgz",
+      "integrity": "sha512-CYAOUCARwExnEixLdB6sDm2dIJ/YgEAKDM1MOeMeZu9Ld/bDgVo8aiWrXwcY7OBh+1Ea2uUcVRcxKk0GJvW7QA==",
+      "dev": true
+    },
+    "@babel/helper-split-export-declaration": {
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.4.tgz",
+      "integrity": "sha512-Ro/XkzLf3JFITkW6b+hNxzZ1n5OQ80NvIUdmHspih1XAhtN3vPTuUFT4eQnela+2MaZ5ulH+iyP513KJrxbN7Q==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.4.4"
+      }
+    },
+    "@babel/helpers": {
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.4.4.tgz",
+      "integrity": "sha512-igczbR/0SeuPR8RFfC7tGrbdTbFL3QTvH6D+Z6zNxnTe//GyqmtHmDkzrqDmyZ3eSwPqB/LhyKoU5DXsp+Vp2A==",
+      "dev": true,
+      "requires": {
+        "@babel/template": "^7.4.4",
+        "@babel/traverse": "^7.4.4",
+        "@babel/types": "^7.4.4"
+      }
+    },
     "@babel/highlight": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0.tgz",
@@ -24,6 +121,302 @@
         "js-tokens": "^4.0.0"
       }
     },
+    "@babel/parser": {
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.4.4.tgz",
+      "integrity": "sha512-5pCS4mOsL+ANsFZGdvNLybx4wtqAZJ0MJjMHxvzI3bvIsz6sQvzW8XX92EYIkiPtIvcfG3Aj+Ir5VNyjnZhP7w==",
+      "dev": true
+    },
+    "@babel/plugin-syntax-object-rest-spread": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-object-rest-spread/-/plugin-syntax-object-rest-spread-7.2.0.tgz",
+      "integrity": "sha512-t0JKGgqk2We+9may3t0xDdmneaXmyxq0xieYcKHxIsrJO64n1OiMWNUtc5gQK1PA0NpdCRrtZp4z+IUaKugrSA==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.0.0"
+      }
+    },
+    "@babel/template": {
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.4.4.tgz",
+      "integrity": "sha512-CiGzLN9KgAvgZsnivND7rkA+AeJ9JB0ciPOD4U59GKbQP2iQl+olF1l76kJOupqidozfZ32ghwBEJDhnk9MEcw==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/parser": "^7.4.4",
+        "@babel/types": "^7.4.4"
+      }
+    },
+    "@babel/traverse": {
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.4.4.tgz",
+      "integrity": "sha512-Gw6qqkw/e6AGzlyj9KnkabJX7VcubqPtkUQVAwkc0wUMldr3A/hezNB3Rc5eIvId95iSGkGIOe5hh1kMKf951A==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/generator": "^7.4.4",
+        "@babel/helper-function-name": "^7.1.0",
+        "@babel/helper-split-export-declaration": "^7.4.4",
+        "@babel/parser": "^7.4.4",
+        "@babel/types": "^7.4.4",
+        "debug": "^4.1.0",
+        "globals": "^11.1.0",
+        "lodash": "^4.17.11"
+      }
+    },
+    "@babel/types": {
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.4.4.tgz",
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+        "lodash": "^4.17.11",
+        "to-fast-properties": "^2.0.0"
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+        "minimist": "^1.2.0"
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+          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
+          "dev": true
+        }
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/@jest/console/-/console-24.7.1.tgz",
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+      "requires": {
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+        "@jest/reporters": "^24.8.0",
+        "@jest/test-result": "^24.8.0",
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@@ -636,6 +1803,15 @@
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       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
@@ -1598,12 +5587,65 @@
         "isexe": "^2.0.0"
       }
     },
+    "which-module": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
+      "dev": true
+    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
       "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
       "dev": true
     },
+    "wrap-ansi": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+      "dev": true,
+      "requires": {
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+          "dev": true
+        },
+        "is-fullwidth-code-point": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+          "dev": true,
+          "requires": {
+            "number-is-nan": "^1.0.0"
+          }
+        },
+        "string-width": {
+          "version": "1.0.2",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "dev": true,
+          "requires": {
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^2.0.0"
+          }
+        }
+      }
+    },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
@@ -1619,6 +5661,76 @@
         "mkdirp": "^0.5.1"
       }
     },
+    "write-file-atomic": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.1.tgz",
+      "integrity": "sha512-TGHFeZEZMnv+gBFRfjAcxL5bPHrsGKtnb4qsFAws7/vlh+QfwAaySIw4AXP9ZskTTh5GWu3FLuJhsWVdiJPGvg==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.11",
+        "imurmurhash": "^0.1.4",
+        "signal-exit": "^3.0.2"
+      }
+    },
+    "ws": {
+      "version": "5.2.2",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-5.2.2.tgz",
+      "integrity": "sha512-jaHFD6PFv6UgoIVda6qZllptQsMlDEJkTQcybzzXDYM1XO9Y8em691FGMPmM46WGyLU4z9KMgQN+qrux/nhlHA==",
+      "dev": true,
+      "requires": {
+        "async-limiter": "~1.0.0"
+      }
+    },
+    "xml-name-validator": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
+      "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==",
+      "dev": true
+    },
+    "y18n": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+      "dev": true
+    },
+    "yargs": {
+      "version": "12.0.5",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
+      "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
+      "dev": true,
+      "requires": {
+        "cliui": "^4.0.0",
+        "decamelize": "^1.2.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^1.0.1",
+        "os-locale": "^3.0.0",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^1.0.1",
+        "set-blocking": "^2.0.0",
+        "string-width": "^2.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^3.2.1 || ^4.0.0",
+        "yargs-parser": "^11.1.1"
+      },
+      "dependencies": {
+        "require-main-filename": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-1.0.1.tgz",
+          "integrity": "sha1-l/cXtp1IeE9fUmpsWqj/3aBVpNE=",
+          "dev": true
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "11.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
+      "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
+    },
     "yn": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.0.tgz",
diff --git a/package.json b/package.json
index a8454e4..00bbf36 100644
--- a/package.json
+++ b/package.json
@@ -9,12 +9,14 @@
   ],
   "scripts": {
     "build": "rimraf dist && tsc -p ./tsconfig.json",
+    "coverage": "npm run unit -- --coverage",
     "format": "npm run prettier -- --write",
     "format:ci": "npm run prettier -- --check",
     "lint": "tslint -p tsconfig.json -c tslint.json",
     "prepare": "npm run build",
-    "prettier": "prettier 'src/**/*.ts' --single-quote --trailing-comma all",
-    "test": "npm run format:ci && npm run lint && echo \"###!!!Warning!!!### No tests exist! We ONLY checked formatting and linting!\""
+    "prettier": "prettier 'src/**/*.ts' 'tests/**/*.spec.ts' --single-quote --trailing-comma all",
+    "test": "npm run format:ci && npm run lint && npm run coverage",
+    "unit": "jest --config=jest.json --runInBand"
   },
   "author": "Tim Akinbo <tim@tanjalo.com>; Christoph Ott <christoph.ott@lean-coders.at>",
   "license": "MIT",
@@ -32,13 +34,16 @@
   "devDependencies": {
     "@types/bs58": "^4.0.0",
     "@types/elliptic": "^6.4.6",
+    "@types/jest": "^24.0.13",
     "@types/node": "^11.13.5",
     "@types/request": "^2.48.1",
     "@types/request-promise": "^4.1.42",
     "@types/underscore": "^1.8.14",
     "eslint": "^5.16.0",
+    "jest": "^24.8.0",
     "prettier": "^1.17.1",
     "rimraf": "^2.6.3",
+    "ts-jest": "^24.0.2",
     "ts-node": "^8.1.0",
     "tslint": "^5.16.0",
     "typescript": "^3.4.4"
diff --git a/src/core/client.ts b/src/core/client.ts
index aada3a9..7f64b88 100644
--- a/src/core/client.ts
+++ b/src/core/client.ts
@@ -2,6 +2,7 @@ import * as elliptic from 'elliptic';
 import * as qs from 'querystring';
 import * as rp from 'request-promise';
 import * as _ from 'underscore';
+import { GetInvoicesArgs, PairClientResponse } from '../models/client';
 import { Cryptography as crypto } from './cryptography';
 import { Invoice } from '../models/invoice';
 import { Rate } from '../models/rate';
@@ -16,6 +17,7 @@ export class BTCPayClient {
     private kp: elliptic.ec.KeyPair,
     private tokens: any = {},
   ) {
+    this.host = this.host.replace(/\/+$/, '');
     this.clientId = crypto.get_sin_from_key(this.kp);
     this.userAgent = 'node-btcpay';
     this.options = {
@@ -29,11 +31,11 @@ export class BTCPayClient {
     };
   }
 
-  public async pair_client(code: string): Promise<any> {
-    const re = new RegExp('^\\w{7,7}$');
+  public async pair_client(code: string): Promise<PairClientResponse> {
+    const re = new RegExp('^\\w{7}$');
 
     if (!re.test(code)) {
-      throw 'pairing code is not valid';
+      throw new Error('pairing code is not valid');
     }
 
     const payload = {
@@ -54,32 +56,36 @@ export class BTCPayClient {
     storeID: string,
   ): Promise<Rate[]> {
     return this.signed_get_request('/rates', {
-      currencyPairs,
+      currencyPairs: currencyPairs.join(','),
       storeID,
     });
   }
 
-  public async create_invoice(payload: any, token?: any): Promise<Invoice> {
-    const re = new RegExp('^[A-Z]{3,3}$');
+  public async create_invoice(
+    payload: { currency: string; price: string | number },
+    token?: any,
+  ): Promise<Invoice> {
+    const re = new RegExp('^[A-Z]{3}$');
 
     if (!re.test(payload.currency)) {
-      throw 'Currency is invalid';
+      throw new Error('Currency is invalid');
     }
 
-    if (isNaN(parseFloat(payload.price))) {
-      throw 'Price must be a float';
+    if (isNaN(parseFloat(payload.price as string))) {
+      throw new Error('Price must be a float');
     }
 
-    return this.signed_post_request('/invoices', payload, token) as Promise<
-      Invoice
-    >;
+    return this.signed_post_request('/invoices', payload, token);
   }
 
-  public async get_invoice(invoiceId: string, token?: any): Promise<Invoice[]> {
+  public async get_invoice(invoiceId: string, token?: any): Promise<Invoice> {
     return this.signed_get_request('/invoices/' + invoiceId, token);
   }
 
-  public async get_invoices(params: any, token?: any): Promise<Invoice[]> {
+  public async get_invoices(
+    params?: GetInvoicesArgs,
+    token?: any,
+  ): Promise<Invoice[]> {
     return this.signed_get_request('/invoices', params, token);
   }
 
@@ -113,7 +119,7 @@ export class BTCPayClient {
 
   private async signed_post_request(
     path: string,
-    payload: any = {},
+    payload: any,
     token: any = _.values(this.tokens)[0],
   ): Promise<any> {
     payload.token = token;
@@ -129,13 +135,11 @@ export class BTCPayClient {
     return rp.post(_options).then((resp: any) => resp.data);
   }
 
-  private async unsigned_request(path: string, payload?: any): Promise<any> {
-    const hasPayload = payload !== undefined;
-
+  private async unsigned_request(path: string, payload: any): Promise<any> {
     const _mixin: any = {
-      method: hasPayload ? 'POST' : 'GET',
+      method: 'POST',
       uri: this.host + path,
-      ...(hasPayload ? { body: payload } : undefined),
+      body: payload,
     };
 
     const _options = { ...JSON.parse(JSON.stringify(this.options)), ..._mixin };
diff --git a/src/models/client.ts b/src/models/client.ts
new file mode 100644
index 0000000..dd21bc2
--- /dev/null
+++ b/src/models/client.ts
@@ -0,0 +1,13 @@
+export interface PairClientResponse {
+  merchant: string;
+}
+
+export interface GetInvoicesArgs {
+  status?: string;
+  orderId?: string;
+  itemCode?: string;
+  dateStart?: string;
+  dateEnd?: string;
+  limit?: number;
+  offset?: number;
+}
diff --git a/src/models/invoice.ts b/src/models/invoice.ts
index 40e73af..723c9a4 100644
--- a/src/models/invoice.ts
+++ b/src/models/invoice.ts
@@ -1,68 +1,73 @@
 export interface Invoice {
-  id: string;
-  token: string;
+  url: string;
+  posData: string | null;
+  status: string;
+  btcPrice: string;
+  btcDue: string;
+  cryptoInfo: Array<{
+    cryptoCode: string;
+    paymentType: string;
+    rate: number;
+    exRates: any[];
+    paid: string;
+    price: string;
+    due: string;
+    paymentUrls: any[];
+    address: string;
+    url: string;
+    totalDue: string;
+    networkFee: string;
+    txCount: number;
+    cryptoPaid: string;
+    payments: any[];
+  }>;
   price: number;
   currency: string;
-  orderId: string;
-  orderID?: string;
-  itemDesc: string;
-  itemCode: string;
-  notificationEmail: string;
-  notificationURL: string;
-  redirectURL: string;
-  paymentUrls?: any;
-  paymentCodes: any;
-  posData: string;
-  transactionSpeed: string;
-  fullNotifications: boolean;
-  extendedNotifications: boolean;
-  physical: boolean;
-  buyer: {
-    name: string;
-    address1: string;
-    address2: string;
-    locality: string;
-    region: string;
-    postalCode: string;
-    country: string;
-    email: string;
-    phone: string;
-    notify: boolean;
-  };
-  url: string;
-  status: string;
-  btcPaid?: number;
-  amountPaid: number;
-  btcPrice?: number;
-  paymentSubtotals: any;
-  btcDue?: number;
-  paymentTotals: any;
-  minerFees: any;
+  exRates: any;
+  buyerTotalBtcAmount: string | null;
+  itemDesc: string | null;
+  itemCode: string | null;
+  orderId: string | null;
+  guid: string;
+  id: string;
   invoiceTime: number;
   expirationTime: number;
-  currentTime: string; // 'date' === string?
-  exceptionStatus: string | boolean;
-  rate?: number;
-  exRates?: any;
-  exchangeRates: any;
-  transactions: Array<{
-    amount: number;
-    confirmations: number;
-    time: string; // 'date' === string?
-    receivedTime: string; // 'date' === string?
-  }>;
-  flags?: {
-    refundable: string;
+  currentTime: number;
+  lowFeeDetected: boolean;
+  btcPaid: string;
+  rate: number;
+  exceptionStatus: boolean;
+  paymentUrls: {
+    BIP21: string | null;
+    BIP72: string | null;
+    BIP72b: string | null;
+    BIP73: string | null;
+    BOLT11: string | null;
   };
-  creditedOverpaymentAmounts: any;
-  refundInfo: Array<{
-    supportRequest: string;
-    currency: string;
-    amounts: any;
-  }>;
-  transactionCurrency: string;
+  refundAddressRequestPending: boolean;
+  buyerPaidBtcMinerFee: string | null;
+  bitcoinAddress: string;
+  token: string;
+  flags: {
+    refundable: boolean;
+  };
+  paymentSubtotals: any;
+  paymentTotals: any;
+  amountPaid: number;
+  minerFees: any;
+  exchangeRates: any;
   supportedTransactionCurrencies: any;
-  buyerProvidedInfo: {
-    selectedTransactionCurrency: any;
+  addresses: any;
+  paymentCodes: any;
+  buyer: {
+    name: string | null;
+    address1: string | null;
+    address2: string | null;
+    locality: string | null;
+    region: string | null;
+    postalCode: string | null;
+    country: string | null;
+    phone: string | null;
+    email: string | null;
   };
 }
diff --git a/src/models/rate.ts b/src/models/rate.ts
index 5a241bc..4a359a8 100644
--- a/src/models/rate.ts
+++ b/src/models/rate.ts
@@ -1,5 +1,7 @@
 export interface Rate {
-  code: string;
   name: string;
+  cryptoCode: string;
+  currencyPair: string;
+  code: string;
   rate: number;
 }
diff --git a/tests/core/client.spec.ts b/tests/core/client.spec.ts
new file mode 100644
index 0000000..032b9d3
--- /dev/null
+++ b/tests/core/client.spec.ts
@@ -0,0 +1,86 @@
+import * as elliptic from 'elliptic';
+import { BTCPayClient } from '../../src/core/client';
+import { Cryptography as myCrypto } from '../../src/core/cryptography';
+
+const USER_NAME = 'test@example.com';
+const PASSWORD = 'satoshinakamoto';
+const URL = 'https://testnet.demo.btcpayserver.org/';
+
+const MY_PRIVATE_KEY = Buffer.from(
+  '31eb31ecf1a640c9d1e0a1105501f36235f8c7d51d67dcf74ccc968d74cb6b25',
+  'hex',
+);
+
+const STORE_ID = 'HPPHFtqtsKsF3KU18fBNwVGP64hicGoRynvQrC3R2Rkw';
+const TOKENS = {
+  merchant: 'DwSMQ4SF7GAJRaMiLn4zjAR35bFJwgSpuKt9pxYoQNjJ',
+};
+
+const INVOICE_ID = 'TRnwXeAkuLQihe22mJs7J4';
+
+// We need a way to programmatically get a new pairing code...
+const SERVER_PAIRING_CODE = 'apYAxP9';
+
+let MY_KEYPAIR: elliptic.ec.KeyPair;
+let client: BTCPayClient;
+describe('btcpay.core.cryptography', () => {
+  beforeAll(() => {
+    MY_KEYPAIR = myCrypto.load_keypair(MY_PRIVATE_KEY);
+    client = new BTCPayClient(URL, MY_KEYPAIR, TOKENS);
+  });
+
+  it('should pair with server', async () => {
+    const myClient = new BTCPayClient(URL, MY_KEYPAIR);
+    const result = await myClient.pair_client(SERVER_PAIRING_CODE).then(
+      v => v,
+      async err => {
+        if (
+          err.message.match(
+            /^404 - {"error":"The specified pairingCode is not found"}$/,
+          )
+        )
+          return { merchant: 'test' };
+        throw err;
+      },
+    );
+    expect(result.merchant).toBeDefined();
+    await expect(myClient.pair_client('hduheufhfuf')).rejects.toThrow(
+      /^pairing code is not valid$/,
+    );
+  });
+
+  it('should get rates', async () => {
+    const results = await client.get_rates(['LTC_USD', 'BTC_USD'], STORE_ID);
+    expect(results[0].rate).toBeDefined();
+  });
+
+  it('should create an invoice', async () => {
+    const results = await client.create_invoice({
+      currency: 'USD',
+      price: 1.12,
+    });
+    expect(results.bitcoinAddress).toBeDefined();
+    await expect(
+      client.create_invoice({
+        currency: 'KDFAHKJFKJ',
+        price: 1.12,
+      }),
+    ).rejects.toThrow(/^Currency is invalid$/);
+    await expect(
+      client.create_invoice({
+        currency: 'USD',
+        price: 'xkhdfhu',
+      }),
+    ).rejects.toThrow(/^Price must be a float$/);
+  });
+
+  it('should get invoice', async () => {
+    const results = await client.get_invoice(INVOICE_ID);
+    expect(results.id).toBe(INVOICE_ID);
+  });
+
+  it('should get multiple invoices', async () => {
+    const results = await client.get_invoices();
+    expect(results[0].bitcoinAddress).toBeDefined();
+  });
+});
diff --git a/tests/core/cryptography.spec.ts b/tests/core/cryptography.spec.ts
new file mode 100644
index 0000000..bbf0f87
--- /dev/null
+++ b/tests/core/cryptography.spec.ts
@@ -0,0 +1,33 @@
+import { Cryptography as myCrypto } from '../../src/core/cryptography';
+
+const MY_PRIVATE_KEY = Buffer.from(
+  '31eb31ecf1a640cd91e0a1105501f36235f8c7d51d67dcf74ccc968d74cb6b25',
+  'hex',
+);
+
+describe('btcpay.core.cryptography', () => {
+  it('should generate a keypair', () => {
+    const kp = myCrypto.generate_keypair();
+    const priv = kp.getPrivate();
+    expect(priv).toBeDefined();
+  });
+  it('should load a keypair from Buffer', () => {
+    const kp = myCrypto.load_keypair(MY_PRIVATE_KEY);
+    const priv = kp.getPrivate();
+    expect(priv).toBeDefined();
+  });
+  it('should get sin from key', () => {
+    const kp = myCrypto.load_keypair(MY_PRIVATE_KEY);
+    const sin = myCrypto.get_sin_from_key(kp);
+    expect(sin).toBe('TfDnXWvj6bBhkduYiZnohg5qhtDu5VWohhw');
+  });
+  it('should sign a message', () => {
+    const kp = myCrypto.load_keypair(MY_PRIVATE_KEY);
+    const message = Buffer.from('Satoshi', 'utf8');
+    const sig = myCrypto.sign(message, kp);
+    expect(sig.toString('hex')).toBe(
+      '304402205b0a505c180bddbd4a8836de0f2ac10b52b327d0e932352d28d170fb81517a' +
+        '770220307ac2ec2134d81fd04df6a1662b0962ad1322209c2e45ff8af63d3f12e0d089',
+    );
+  });
+});
diff --git a/tests/index.spec.ts b/tests/index.spec.ts
new file mode 100644
index 0000000..b70a267
--- /dev/null
+++ b/tests/index.spec.ts
@@ -0,0 +1,7 @@
+import * as btcpay from '../src/index';
+
+describe('btcpay.index', () => {
+  it('should import', () => {
+    expect(btcpay).toBeDefined();
+  });
+});
diff --git a/tests/sample.js b/tests/sample.js
deleted file mode 100644
index 7afdade..0000000
--- a/tests/sample.js
+++ /dev/null
@@ -1,9 +0,0 @@
-const btcpay = require('../dist');
-const keypair = btcpay.crypto.load_keypair(new Buffer.from('', 'hex'));
-
-const client = new btcpay.BTCPayClient('', keypair, { merchant: '' });
-
-client
-  .get_rates('BTC_USD', '')
-  .then(rates => console.log(rates))
-  .catch(err => console.log(err));
diff --git a/tests/sample.ts b/tests/sample.ts
deleted file mode 100644
index 383c99e..0000000
--- a/tests/sample.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-import * as btcpay from '../dist';
-import { METHODS } from 'http';
-
-const keypair = btcpay.crypto.load_keypair(Buffer.from('', 'hex'));
-
-const client = new btcpay.BTCPayClient('', keypair, {
-  merchant: '',
-});
-
-async function test() {
-  try {
-    const rates = await client.get_rates('BTC_EUR', '');
-    console.log(JSON.stringify(rates));
-  } catch (err) {
-    console.log(err);
-  }
-}
-
-test();