Create stripe api endpoint for apple pay donations

service/src/main/java/org/whispersystems/textsecuregcm/entities/ApplePayAuthorizationRequest.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2021 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.whispersystems.textsecuregcm.entities;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.google.common.annotations.VisibleForTesting;
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotEmpty;
+import javax.validation.constraints.Pattern;
+import javax.validation.constraints.Size;
+
+public class ApplePayAuthorizationRequest {
+
+  private String currency;
+  private long amount;
+
+  @JsonProperty
+  @NotEmpty
+  @Size(min=3, max=3)
+  @Pattern(regexp="[a-z]{3}")
+  public String getCurrency() {
+    return currency;
+  }
+
+  public void setCurrency(final String currency) {
+    this.currency = currency;
+  }
+
+  @JsonProperty
+  @Min(0)
+  public long getAmount() {
+    return amount;
+  }
+
+  @VisibleForTesting
+  public void setAmount(final long amount) {
+    this.amount = amount;
+  }
+}

service/src/main/java/org/whispersystems/textsecuregcm/entities/ApplePayAuthorizationResponse.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2021 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.whispersystems.textsecuregcm.entities;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import io.dropwizard.util.Strings;
+import javax.validation.constraints.NotEmpty;
+
+public class ApplePayAuthorizationResponse {
+
+  private final String id;
+  private final String clientSecret;
+
+  @JsonCreator
+  public ApplePayAuthorizationResponse(
+      @JsonProperty("id") final String id,
+      @JsonProperty("client_secret") final String clientSecret) {
+    if (Strings.isNullOrEmpty(id)) {
+      throw new IllegalArgumentException("id cannot be empty");
+    }
+    if (Strings.isNullOrEmpty(clientSecret)) {
+      throw new IllegalArgumentException("clientSecret cannot be empty");
+    }
+
+    this.id = id;
+    this.clientSecret = clientSecret;
+  }
+
+  @JsonProperty("id")
+  @NotEmpty
+  public String getId() {
+    return id;
+  }
+
+  @JsonProperty("client_secret")
+  @NotEmpty
+  public String getClientSecret() {
+    return clientSecret;
+  }
+}